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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, 2015 54,600      
Balance at Dec. 31, 2015 $ 546 $ 76,468 $ 332,407 $ 409,421
Net income     25,161 25,161
Repurchase and retirement of common stock (in shares) (759)      
Repurchase and retirement of common stock $ (8) (7,508) 3 (7,513)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 445      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 5 3,505 (2) 3,508
Tax deficiencies from share-based payment arrangement exercises   (55)   (55)
Employee taxes paid in exchange for shares withheld   (127)   (127)
Share-based payment arrangement compensation expense   741   741
Dividends on common stock     (2,436) (2,436)
Balance (in shares) at Sep. 30, 2016 54,286      
Balance at Sep. 30, 2016 $ 543 73,024 355,133 428,700
Net income     8,303 8,303
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 106      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 1 908 (1) 908
Share-based payment arrangement compensation expense   142   142
Dividends on common stock     (816) (816)
Balance (in shares) at Dec. 31, 2016 54,392      
Balance at Dec. 31, 2016 $ 544 74,175 362,619 437,338
Tax benefits from share-based payment arrangement exercises   101   101
Net income     25,210 25,210
Repurchase and retirement of common stock       0
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)
Balance (in shares) at Sep. 30, 2017 54,522      
Balance at Sep. 30, 2017 $ 545 75,951 $ 384,830 461,326
Cash in lieu of fractional shares from stock split   $ (54)   $ (54)