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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in-Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 1,348,549 | $ 996 | $ (5,362) | $ 985,023 | $ 367,892
Balance, shares at Dec. 31, 2013 |  | 100,699 | 167 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Fees (2013 issuance of common stock) | (176) |  |  | (176) |
Stock-based compensation | 4,681 |  |  | 4,681 |
Stock-based compensation, shares |  | 550 |  |  |
Vesting of restricted shares |  | 3 |  | (3) |
Treasury stock – tax withholdings | (3,025) |  | (3,025) |  |
Treasury stock - tax withholdings, shares |  | (71) | 71 |  |
Net income | 169,953 |  |  |  | 169,953
Balance at Mar. 31, 2014 | $ 1,519,982 | $ 999 | $ (8,387) | $ 989,525 | $ 537,845
Balance, shares at Mar. 31, 2014 |  | 101,178 | 238 |  |

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