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       53,142 53,142
Share-based compensation     7,473   7,473
Issuance of restricted share awards under long-term equity incentive plan 1   (1)    
Repurchase of shares of common stock pursuant to Share Repurchase Program   (39,286)     (39,286)
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program   (80,000) (20,000)   (100,000)
Shares of common stock withheld to pay taxes on employees' equity awards     (4,475)   (4,475)
Balance at Sep. 30, 2017 386 (141,582) 828,473 202,124 889,401
Balance at Dec. 31, 2017 386 (141,582) 830,600 307,115 996,519
Increase (Decrease) in Stockholders' Equity          
Net income       96,198 96,198
Share-based compensation     8,244   8,244
Issuance of restricted share awards under long-term equity incentive plan 1   (1)    
Repurchase of shares of common stock pursuant to Share Repurchase Program   (9,493)     (9,493)
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     (5,433)   (5,433)
Balance at Sep. 30, 2018 $ 387 $ (171,075) $ 853,410 $ 403,313 $ 1,086,035