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Net Income Per Share (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income $ 5,289 [1] $ 10,082 $ 3,488 [2] $ 13,173 $ 9,445 $ 11,452 $ 5,621 $ 13,884 $ 32,032 $ 40,402 $ 30,470
Less distributed and undistributed earnings allocated to participating securities                 (916) (1,224) (908)
Net income allocated to common shares                 $ 31,116 $ 39,178 $ 29,562
Weighted average common shares outstanding                 24,850 25,007 25,405
Incremental shares from assumed conversions of common stock options                 22 60 92
Adjusted weighted average common shares outstanding                 24,872 25,067 25,497
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect                 8 29 29
[1] Includes a $2.0 million tax benefit related to tax years 2009 through 2012. Please read Note 9 to the Consolidated Financial Statements, “Income Taxes,” for additional information.
[2] Includes the impact of a $2.7 million non-cash impairment charge. Please read Note 6 to the Consolidated Financial Statements, “Other Assets,” for additional information.