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Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Calculation of basic and diluted earnings per share |  |  |  |
Net income | $ 208,938 | $ 70,690 | $ 334,325 | $ 163,939
Basic weighted-average common shares outstanding | 67,379 | 66,943 | 67,169 | 66,486
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 1,051 | 1,310 | 1,089 | 1,483
Diluted weighted-average common shares outstanding | 68,430 | 68,253 | 68,258 | 67,969
Basic net income per common share | $ 3.10 | $ 1.06 | $ 4.98 | $ 2.47
Diluted net income per common share | $ 3.05 | $ 1.04 | $ 4.90 | $ 2.41
Performance Shares [Member] |  |  |  |
Earnings per share |  |  |  |
Performance period to receive awards (in years) |  |  | 3 |
Maximum [Member] | Performance Shares [Member] |  |  |  |
Earnings per share |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 200.00% |
Minimum [Member] | Performance Shares [Member] |  |  |  |
Earnings per share |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 0.00% |

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