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Summary of Significant Accounting Policies Earnings Per Share (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Convertible Debt [Member] | Dec. 31, 2013 Convertible Debt [Member] | Dec. 31, 2010 Convertible Debt [Member] | Dec. 31, 2013 Retained Earnings | Dec. 31, 2012 Retained Earnings | Dec. 31, 2011 Retained Earnings
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.50% | 3.50% | 3.50% |  |  |
Debt instrument convertible conversion rate |  |  |  | 864,106 |  |  |  |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock |  |  |  | $ 1,000 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  | $ 54.42 |  |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | 1,383,000 | 0 | 3,809,000 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 2,102,000 | 0 |  |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |
Net Income (loss) | $ 170,935,000 | $ (54,249,000) | $ 215,416,000 |  |  |  | $ 170,935,000 | $ (54,249,000) | $ 215,416,000
Weighted Average Number of Shares Outstanding, Basic | 66,615,000 | 65,138,000 | 63,755,000 |  |  |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 1,383,000 | 0 | 2,592,000 |  |  |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities | 0 | 0 | 1,217,000 |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted | 67,998,000 | 65,138,000 | 67,564,000 |  |  |  |  |  |
Basic net income (loss) per common share | $ 2.57 | $ (0.83) | $ 3.38 |  |  |  |  |  |
Diluted net income (loss) per common share | $ 2.51 | $ (0.83) | $ 3.19 |  |  |  |  |  |

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