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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ 2,187,607 | $ 1,815 | $ 796,641 | $ 1,987,999 | $ 21,597 | $ (620,445)
Beginning Balance (in shares) at Dec. 31, 2010 |  | 181,538,000 |  |  |  |
Net income | 322,413 |  |  | 322,413 |  |
Foreign currency translation adjustment | (2,138) |  |  |  | (2,138) |
Issuance of restricted stock (in shares) |  | 782,000 |  |  |  |
Issuance of restricted stock |  | 8 | (8) |  |  |
Vesting of restricted stock units |  | 10,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (83,000) |  |  |  |
Forfeitures of restricted stock |  | (1) | 1 |  |  |
Exercise of stock options (in shares) |  | 1,048,000 |  |  |  |
Exercise of stock options | 16,811 | 11 | 16,800 |  |  |
Stock-based compensation | 20,904 |  | 20,904 |  |  |
Tax expense/benefit related to stock-based compensation | 6,393 |  | 6,393 |  |  |
Payment of cash dividends | (31,045) |  |  | (31,045) |  |
Purchase of treasury stock | (4,314) |  |  |  |  | (4,314)
Ending Balance at Dec. 31, 2011 | 2,516,631 | 1,833 | 840,731 | 2,279,367 | 19,459 | (624,759)
Ending Balance (in shares) at Dec. 31, 2011 |  | 183,295,000 |  |  |  |
Net income | 299,477 |  |  | 299,477 |  |
Foreign currency translation adjustment | 2,308 |  |  |  | 2,308 |
Issuance of restricted stock (in shares) |  | 792,000 |  |  |  |
Issuance of restricted stock |  | 8 | (8) |  |  |
Vesting of restricted stock units |  | 8,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (99,000) |  |  |  |
Forfeitures of restricted stock |  | (1) | 1 |  |  |
Exercise of stock options (in shares) |  | 64,000 |  |  |  |
Exercise of stock options | 934 | 1 | 933 |  |  |
Stock-based compensation | 23,185 |  | 23,185 |  |  |
Tax expense/benefit related to stock-based compensation | (1,284) |  | (1,284) |  |  |
Payment of cash dividends | (30,302) |  |  | (30,302) |  |
Purchase of treasury stock | (170,292) |  |  |  |  | (170,292)
Ending Balance at Dec. 31, 2012 | 2,640,657 | 1,841 | 863,558 | 2,548,542 | 21,767 | (795,051)
Ending Balance (in shares) at Dec. 31, 2012 | 184,059,900 | 184,060,000 |  |  |  |
Net income | 188,009 |  |  | 188,009 |  |
Foreign currency translation adjustment | (7,691) |  |  |  | (7,691) |
Issuance of restricted stock (in shares) |  | 1,312,000 |  |  |  |
Issuance of restricted stock |  | 13 | (13) |  |  |
Vesting of restricted stock units |  | 9,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (84,000) |  |  |  |
Forfeitures of restricted stock |  | (1) | 1 |  |  |
Exercise of stock options (in shares) | 1,190,000 | 1,190,000 |  |  |  |
Exercise of stock options | 19,286 | 12 | 19,274 |  |  |
Stock-based compensation | 25,891 |  | 25,891 |  |  |
Tax expense/benefit related to stock-based compensation | 4,794 |  | 4,794 |  |  |
Payment of cash dividends | (29,112) |  |  | (29,112) |  |
Purchase of treasury stock | (85,837) |  |  |  |  | (85,837)
Ending Balance at Dec. 31, 2013 | $ 2,755,997 | $ 1,865 | $ 913,505 | $ 2,707,439 | $ 14,076 | $ (880,888)
Ending Balance (in shares) at Dec. 31, 2013 | 186,487,246 | 186,487,000 |  |  |  |

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