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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Balances, Common Shares, Beginning at Dec. 31, 2012 |  | 66,245,816 |  |  |  |
Balances, Beginning at Dec. 31, 2012 | $ 1,414,466 | $ 662 | $ 233,642 |  | $ 1,190,397 | $ (9,014)
Balances, Treasury Shares, Beginning at Dec. 31, 2012 |  |  |  | (50,581) |  |
Balances, Treasury Stock, Value, Beginning at Dec. 31, 2012 |  |  |  | $ (1,221) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 170,935 |  |  |  | 170,935 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 3,598 |  |  |  |  | 3,598
Cash dividends, $ 0.10 per share | (6,663) |  |  |  | (6,663) |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 77,427 |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 3,672 | $ 1 | 3,671 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 526,852 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | $ (16,220) | $ 5 | (16,225) |  |  |
Issuance of common stock upon stock option exercises (in shares) | 228,758 | 228,758 |  |  |  |
Issuance of common stock upon stock option exercises | $ 3,186 | $ 3 | 3,183 |  |  |
Stock-based compensation expense (in shares) |  | 0 |  | 28,169 |  |
Stock-based compensation expense | 32,347 | $ 0 | 31,949 | $ 398 |  |
Other income tax benefit (expense) | 1,500 |  | 1,500 |  |  |
Balances, Common Shares, Ending at Dec. 31, 2013 |  | 67,078,853 |  |  |  |
Balances, Ending at Dec. 31, 2013 | $ 1,606,821 | $ 671 | 257,720 |  | 1,354,669 | (5,416)
Balances, Treasury Shares, Ending at Dec. 31, 2013 |  |  |  | (22,412) |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2013 |  |  |  | $ (823) |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | $ 666,051 |  |  |  | 666,051 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (5,896) |  |  |  |  | (5,896)
Cash dividends, $ 0.10 per share | (6,723) |  |  |  | (6,723) |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 83,136 |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 4,061 | $ 1 | 4,060 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 256,718 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | $ (10,624) | $ 3 | (10,627) |  |  |
Issuance of common stock upon stock option exercises (in shares) | 39,088 | 39,088 |  |  |  |
Issuance of common stock upon stock option exercises | $ 816 | $ 0 | 816 |  |  |
Stock-based compensation expense (in shares) |  | 5,265 |  | 22,412 |  |
Stock-based compensation expense | 32,694 | $ 0 | 31,871 | $ 823 |  |
Other income tax benefit (expense) | (545) |  | (545) |  |  |
Balances, Common Shares, Ending at Dec. 31, 2014 |  | 67,463,060 |  |  |  |
Balances, Ending at Dec. 31, 2014 | $ 2,286,655 | $ 675 | 283,295 |  | 2,013,997 | (11,312)
Balances, Treasury Shares, Ending at Dec. 31, 2014 |  |  |  | 0 |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2014 |  |  |  | $ 0 |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | $ (447,710) |  |  |  | (447,710) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (2,090) |  |  |  |  | (2,090)
Cash dividends, $ 0.10 per share | (6,772) |  |  |  | (6,772) |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 197,214 |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 4,844 | $ 2 | 4,842 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 375,523 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | (8,678) | $ 4 | (8,682) |  |  |
Stock-based compensation expense (in shares) |  | 39,903 |  | 0 |  |
Stock-based compensation expense | 27,467 | $ 0 | 27,467 | $ 0 |  |
Other income tax benefit (expense) | (1,315) |  | (1,315) |  |  |
Balances, Common Shares, Ending at Dec. 31, 2015 |  | 68,075,700 |  |  |  |
Balances, Ending at Dec. 31, 2015 | $ 1,852,401 | $ 681 | $ 305,607 |  | $ 1,559,515 | $ (13,402)
Balances, Treasury Shares, Ending at Dec. 31, 2015 |  |  |  | 0 |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2015 |  |  |  | $ 0 |  |

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