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Earnings per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Earnings per share |  |  |  |
Document Period End Date |  |  | Jun. 30, 2013 |
Calculation of basic and diluted earnings per share |  |  |  |
Net income | $ 76,522,000 | $ 24,889,000 | $ 93,249,000 | $ 51,225,000
Basic weighted-average common shares outstanding | 66,295 | 64,585 | 66,254 | 64,345
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 1,598 | 2,149 | 1,457 | 2,182
Add: dilutive effect of 3.50% Senior Convertible Notes | 0 | 822 | 0 | 1,279
Diluted weighted-average common shares outstanding | 67,893 | 67,556 | 67,711 | 67,806
Basic net income per common share | $ 1.15 | $ 0.39 | $ 1.41 | $ 0.80
Diluted net income per common share | $ 1.13 | $ 0.37 | $ 1.38 | $ 0.76
Performance Shares [Member] |  |  |  |
Earnings per share |  |  |  |
Performance period to receive awards (in years) |  |  | 3 |
Common stock awards vesting multiplier, low end of range | 0 |  | 0 |
Common stock awards vesting multiplier, high end of range | 2 |  | 2 |
Convertible Debt [Member] |  |  |  |
Earnings per share |  |  |  |
Interest rate on notes (as a percent) | 3.50% |  | 3.50% |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock | $ 1,000 |  |  |
Common stock conversion price (in dollars per share) |  | $ 54.42 |  | $ 54.42

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