Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF EQUITY

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CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
$ in Thousands
Common Stock
Treasury Stock at Cost
Additional Paid-in Capital
Retained Earnings
Total
Balance at Dec. 31, 2016 $ 385 $ (22,296) $ 845,476 $ 148,982 $ 972,547
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (1,710) (1,710)
Share-based compensation     2,084   2,084
Issuance of restricted share awards under long-term equity incentive plan 1   (1)    
Repurchase of shares of common stock pursuant to Share Repurchase Program   (17,379)     (17,379)
Shares of common stock withheld to pay taxes on employees' equity awards     (1,583)   (1,583)
Balance at Mar. 31, 2017 386 (39,675) 845,976 147,272 953,959
Balance at Dec. 31, 2017 386 (141,582) 830,600 307,115 996,519
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       26,388 26,388
Share-based compensation     2,402   2,402
Issuance of restricted share awards under long-term equity incentive plan 1   (1)    
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program   (20,000) 20,000    
Shares of common stock withheld to pay taxes on employees' equity awards     (4,514)   (4,514)
Balance at Mar. 31, 2018 $ 387 $ (161,582) $ 848,487 $ 333,503 $ 1,020,795