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Operations and Significant Accounting Policies (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net income $ 7,852 $ 8,873 $ 7,461 $ 6,312 $ 11,339 $ 1,972 $ 10,255 $ 8,626 $ 30,498 $ 32,192 $ 35,939
Basic-weighted average shares outstanding                 27,653 27,401 27,722
Effect of dilutive potential securities                 205 368 392
Diluted-weighted average shares outstanding                 27,858 27,769 28,114
Basic EPS (in dollars per share) $ 0.28 $ 0.32 $ 0.27 $ 0.23 $ 0.41 $ 0.07 $ 0.38 $ 0.32 $ 1.10 $ 1.17 $ 1.30
Diluted EPS (in dollars per share) $ 0.28 $ 0.32 $ 0.27 $ 0.23 $ 0.41 $ 0.07 $ 0.37 $ 0.31 $ 1.09 $ 1.16 $ 1.28
Shares excluded from computation of earnings per share                 500 0 0