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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2017 $ 66,321 $ 555 $ 25,337 $ (256,363) $ 296,792
Purchase of treasury stock, at cost (16,227) 0 0 (16,227) 0
Issuance of long-term incentive awards and dividend equivalents 0 0 (5,764) 6,619 (855)
Stock-based compensation expense 8,887 0 7,005 1,882 0
Other 1,110 0 785 325 0
Dividends paid (16,786) 0 0 0 (16,786)
Unrealized gain on marketable securities, net of tax 4 0 0 0 4
Net income 74,551 0 0 0 74,551
Balance at Jun. 30, 2018 117,860 $ 555 27,363 (263,764) 353,706
Balance (shares) at Dec. 31, 2017   55,489      
Balance (shares) at Jun. 30, 2018   55,489      
Balance at Mar. 31, 2018 102,832 $ 555 22,648 (257,898) 337,527
Purchase of treasury stock, at cost (7,662) 0 0 (7,662) 0
Stock-based compensation expense 5,752 0 4,165 1,587 0
Other 759 0 550 209 0
Dividends paid (8,384) 0 0 0 (8,384)
Unrealized gain on marketable securities, net of tax 3 0 0 0 3
Net income 24,560 0 0 0 24,560
Balance at Jun. 30, 2018 117,860 $ 555 27,363 (263,764) 353,706
Balance (shares) at Mar. 31, 2018   55,489      
Balance (shares) at Jun. 30, 2018   55,489      
Balance at Dec. 31, 2018 77,676 $ 555 36,752 (357,569) 397,938
Purchase of treasury stock, at cost (38,796) 0 0 (38,796) 0
Issuance of long-term incentive awards and dividend equivalents 0 0 (7,695) 8,646 (951)
Stock-based compensation expense 14,296 0 10,776 3,520 0
Other 1,545 0 1,176 369 0
Dividends paid (24,740) 0 0 0 (24,740)
Unrealized gain on marketable securities, net of tax 63 0 0 0 63
Net income 104,845 0 0 0 104,845
Balance at Jun. 30, 2019 134,889 $ 555 41,009 (383,830) 477,155
Balance (shares) at Dec. 31, 2018   55,489      
Balance (shares) at Jun. 30, 2019   55,489      
Balance at Mar. 31, 2019 119,194 $ 555 33,833 (376,097) 460,903
Purchase of treasury stock, at cost (9,759) 0 0 (9,759) 0
Stock-based compensation expense 8,256 0 6,436 1,820 0
Other 946 0 740 206 0
Dividends paid (12,354) 0 0 0 (12,354)
Unrealized gain on marketable securities, net of tax 50 0 0 0 50
Net income 28,556 0 0 0 28,556
Balance at Jun. 30, 2019 $ 134,889 $ 555 $ 41,009 $ (383,830) $ 477,155
Balance (shares) at Mar. 31, 2019   55,489      
Balance (shares) at Jun. 30, 2019   55,489