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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, 2014 33,419      
Balance at Dec. 31, 2014 $ 334 $ 87,370 $ 300,222 $ 387,926
Net income     18,545 18,545
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 200      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 2 2,301   2,303
Tax benefits from share-based payment arrangement exercises   448   448
Share-based payment arrangement compensation expense   856   856
Dividends on common stock     (1,678) (1,678)
Balance (in shares) at Mar. 31, 2015 33,619      
Balance at Mar. 31, 2015 $ 336 90,975 317,089 408,400
Net income     17,200 17,200
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 82      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 1 1,186   1,187
Share-based payment arrangement compensation expense   548   548
Dividends on common stock     (1,664) (1,664)
Balance (in shares) at Dec. 31, 2015 32,760      
Balance at Dec. 31, 2015 $ 328 76,468 332,625 409,421
Repurchase and retirement of common stock (in shares) (941)      
Repurchase and retirement of common stock $ (9) (16,166)   (16,175)
Tax deficiencies from share-based payment arrangement exercises   (75)   (75)
Repurchase and retirement of common stock $ (9) (16,166)   (16,175)
Tax deficiencies from share-based payment arrangement exercises   75   75
Net income     16,724 16,724
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) 162      
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards $ 2 2,052   2,054
Share-based payment arrangement compensation expense   668   668
Dividends on common stock     (1,622) (1,622)
Balance (in shares) at Jun. 30, 2016 32,466      
Balance at Jun. 30, 2016 $ 325 71,405 347,727 419,457
Repurchase and retirement of common stock (in shares) (456)      
Repurchase and retirement of common stock $ (5) (7,508) (7,513)
Tax deficiencies from share-based payment arrangement exercises 148 148
Repurchase and retirement of common stock (5) (7,508) (7,513)
Tax deficiencies from share-based payment arrangement exercises (148) (148)
Employee taxes paid in exchange for shares withheld   $ (127)   $ (127)