v2.4.0.8
Earnings per Common Share Basic Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic earnings per common share [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number 4,283,456   4,283,456  
Net Income $ 11,304 $ 10,869 $ 26,891 $ 27,237
Basic net income [Abstract]        
Income attributable to preferred stock (1,798) (1,756) (4,289) (4,406)
Common Class A [Member]
       
Basic net income [Abstract]        
Net income allocated, basic 8,249 7,451 19,514 18,608
Basic weighted-average shares issued and outstanding [Abstract]        
Weighted-average Class B shares issued and outstanding 31,463,000 29,098,000 31,208,000 28,968,000
Basic earnings per common share [Abstract]        
Basic earnings per Class A common share $ 0.26 $ 0.26 $ 0.63 $ 0.64
Re-Allocated Earnings 1,087 1,394 2,642 3,537
Undistributed Earnings, Diluted 9,336 8,845 22,156 22,145
Incremental Common Shares Attributable to Conversions of Other Classes of Common Stock 4,975,000 6,640,000 5,086,000 6,830,000
Diluted Weighted-Average Number of Shares Outstanding 36,686,000 35,746,000 36,458,000 35,810,000
Diluted Earnings Per Share $ 0.25 $ 0.25 $ 0.61 $ 0.62
Common Class A [Member] | Common Class B [Member]
       
Basic net income [Abstract]        
Undistributed Earnings Allocated to Participating Securities 1,257 1,662 3,088 4,223
Common Class B [Member]
       
Basic net income [Abstract]        
Net income allocated, basic 1,027 1,324 2,505 3,340
Basic weighted-average shares issued and outstanding [Abstract]        
Weighted-average Class B shares issued and outstanding 3,917,000 5,171,000 4,006,000 5,200,000
Basic earnings per common share [Abstract]        
Basic earnings per Class A common share $ 0.26 $ 0.26 $ 0.63 $ 0.64
Re-Allocated Earnings 239 319 586 883
Undistributed Earnings, Diluted 1,266 1,643 3,091 4,223
Diluted Weighted-Average Number of Shares Outstanding 4,975,000 6,640,000 5,086,000 6,830,000
Diluted Earnings Per Share $ 0.25 $ 0.25 $ 0.61 $ 0.62
Common Class B [Member] | Common Class A [Member]
       
Basic net income [Abstract]        
Undistributed Earnings Allocated to Participating Securities $ 8,479 $ 7,789 $ 20,097 $ 19,491
Employee Stock [Member] | Common Class A [Member]
       
Basic earnings per common share [Abstract]        
Incremental Common Shares Attributable to Share-based Payment Arrangements 2,000 5,000 0 7,000
Restricted Stock Units (RSUs) [Member] | Common Class A [Member]
       
Basic earnings per common share [Abstract]        
Incremental Common Shares Attributable to Share-based Payment Arrangements 205,000 3,000 154,000 5,000
Employee Stock Option [Member] | Common Class A [Member]
       
Basic earnings per common share [Abstract]        
Incremental Common Shares Attributable to Share-based Payment Arrangements 41,000 0 10,000 0
Employee Stock Option [Member] | Common Class B [Member]
       
Basic earnings per common share [Abstract]        
Incremental Common Shares Attributable to Share-based Payment Arrangements 1,058,000 1,469,000 1,080,000 1,630,000