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, 2015 $ 377   $ 838,976 $ 76,376 $ 915,729
Increase (Decrease) in Stockholders' Equity          
Net income       51,299 51,299
Separation-related adjustments     (153)   (153)
Share-based compensation     5,743   5,743
Issuance of restricted share awards under long-term equity incentive plan 8   (8)    
Repurchase of shares of common stock pursuant to Share Repurchase Program   $ (11,377)     (11,377)
Shares of common stock withheld to pay taxes on employees' equity awards     (1,668)   (1,668)
Balance at Sep. 30, 2016 385 (11,377) 842,890 127,675 959,573
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