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       21,749 21,749
Share-based compensation     5,101   5,101
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)
Shares of common stock withheld to pay taxes on employees' equity awards     (2,147)   (2,147)
Balance at Jun. 30, 2017 386 (61,582) 848,429 170,731 957,964
Balance at Dec. 31, 2017 386 (141,582) 830,600 307,115 996,519
Increase (Decrease) in Stockholders' Equity          
Net income       53,540 53,540
Share-based compensation     5,397   5,397
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     (4,531)   (4,531)
Balance at Jun. 30, 2018 $ 387 $ (161,582) $ 851,465 $ 360,655 $ 1,050,925