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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,700   1,300  
Net income $ 2,884 $ 7,461 $ 619 $ 13,773
Basic-weighted average shares outstanding (in shares) 27,776 27,620 27,753 27,603
Effect of dilutive potential securities (in shares) 165 237 173 236
Diluted- weighted average shares outstanding (in shares) 27,941 27,857 27,926 27,839
Basic (in dollars per share) $ 0.10 $ 0.27 $ 0.02 $ 0.50
Diluted (in dollars per share) $ 0.10 $ 0.27 $ 0.02 $ 0.49