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Consolidated Condensed Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2016 54,392      
Balance at Dec. 31, 2016 $ 544 $ 74,175 $ 362,619 $ 437,338
Net income     25,210 25,210
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 130      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 1 961   962
Employee taxes paid in exchange for shares withheld   (47)   (47)
Share-based payment arrangement compensation expense   916   916
Dividends on common stock     (2,999) (2,999)
Cash in lieu of fractional shares from stock split   (54)   (54)
Balance (in shares) at Sep. 30, 2017 54,522      
Balance at Sep. 30, 2017 $ 545 75,951 384,830 461,326
Net income     65,074 65,074
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 11      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   128   128
Share-based payment arrangement compensation expense   334   334
Dividends on common stock     (1,362) (1,362)
Balance (in shares) at Dec. 31, 2017 54,533      
Balance at Dec. 31, 2017 $ 545 76,413 448,542 525,500
Net income     39,290 39,290
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 130      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 2 893   895
Employee taxes paid in exchange for shares withheld   (104)   (104)
Share-based payment arrangement compensation expense   2,102   2,102
Dividends on common stock     (4,098) (4,098)
Balance (in shares) at Sep. 30, 2018 54,663      
Balance at Sep. 30, 2018 $ 547 $ 79,304 484,219 564,070
Adoption of accounting standard (Note 2)     $ 485 $ 485