Annual report pursuant to Section 13 and 15(d)

Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details)

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Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Remaining Contractual Life - Years 4 years 10 months 2 days 5 years 8 months 8 days  
Number of options outstanding 1,639,842 1,674,065 1,772,348
Weighted Average Exercise Price Stock Options Outstanding $ 11.46 $ 11.37 $ 11.81
Number of Awards Vested 1,523,536 1,345,541  
Weighted Average Exercise Price $ 11.82 $ 12.62  
Weighted Average Remaining Contractual Life of Stock Options Vested 4 years 7 months 13 days 5 years 1 month 2 days  
Range 1 [Member]
     
Exercise price lower range limit $ 4.50 $ 4.50  
Exercise price upper range limit $ 8.70 $ 8.70  
Weighted Average Remaining Contractual Life - Years 6 years 3 months 7 days 7 years 25 days  
Number of options outstanding 844,801 871,195  
Weighted Average Exercise Price Stock Options Outstanding $ 6.33 $ 6.38  
Number of Awards Vested 728,495 542,671  
Weighted Average Exercise Price $ 6.27 $ 6.48  
Weighted Average Remaining Contractual Life of Stock Options Vested 6 years 14 days 6 years 5 months 8 days  
Range 2 [Member]
     
Exercise price lower range limit $ 9 $ 9  
Exercise price upper range limit $ 12.90 $ 12.90  
Weighted Average Remaining Contractual Life - Years 4 years 11 months 8 days 5 years 29 days  
Number of options outstanding 130,037 152.34  
Weighted Average Exercise Price Stock Options Outstanding $ 10.46 $ 10.51  
Number of Awards Vested 130,037 152,340  
Weighted Average Exercise Price $ 10.46 $ 10.51  
Weighted Average Remaining Contractual Life of Stock Options Vested 4 years 11 months 8 days 5 years 29 days  
Range 3 [Member]
     
Exercise price lower range limit $ 13.50 $ 13.50  
Exercise price upper range limit $ 18.90 $ 18.90  
Weighted Average Remaining Contractual Life - Years 3 years 3 months 18 days 4 years 3 months 4 days  
Number of options outstanding 358,336 343,862  
Weighted Average Exercise Price Stock Options Outstanding $ 14.17 $ 14.14  
Number of Awards Vested 358,336 343,862  
Weighted Average Exercise Price $ 14.17 $ 14.14  
Weighted Average Remaining Contractual Life of Stock Options Vested 3 years 3 months 18 days 4 years 3 months 4 days  
Range 4 [Member]
     
Exercise price lower range limit $ 19.20 $ 19.20  
Exercise price upper range limit $ 23.85 $ 23.85  
Weighted Average Remaining Contractual Life - Years 2 years 7 months 24 days 3 years 7 months 24 days  
Number of options outstanding 306,668 306,668  
Weighted Average Exercise Price Stock Options Outstanding $ 22.84 $ 22.84  
Number of Awards Vested 306,668 306,668  
Weighted Average Exercise Price $ 22.84 $ 22.84  
Weighted Average Remaining Contractual Life of Stock Options Vested 2 years 7 months 24 days 3 years 7 months 24 days