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Earnings per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Calculation of basic and diluted earnings per share |  |  |  |
Net income (loss) | $ 70,690,000 | $ (38,336,000) | $ 163,939,000 | $ 12,889,000
Basic weighted-average common shares outstanding | 66,943 | 65,745 | 66,486 | 64,815
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 1,310 | 0 | 1,483 | 1,870
Add: dilutive effect of 3.50% Senior Convertible Notes | 0 | 0 | 0 | 658
Diluted weighted-average common shares outstanding | 68,253 | 65,745 | 67,969 | 67,343
Basic net income (loss) per common share | $ 1.06 | $ (0.58) | $ 2.47 | $ 0.20
Diluted net income (loss) per common share | $ 1.04 | $ (0.58) | $ 2.41 | $ 0.19
Performance Shares [Member] |  |  |  |
Earnings per share |  |  |  |
Performance period to receive awards (in years) |  |  | 3 |
Common stock awards vesting multiplier, low end of range |  |  | 0 |
Common stock awards vesting multiplier, high end of range |  |  | 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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