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QUARTERLY DATA -UNAUDITED (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Total revenues $ 236,312 $ 242,025 $ 260,051 $ 244,724 $ 218,999 $ 224,028 $ 203,655 $ 178,899 $ 983,112 $ 825,581 $ 718,515
Total costs and expenses 223,567 226,496 243,143 231,161 211,990 209,594 191,807 172,616 924,367 786,007 677,947
Earnings before provision for income taxes 12,745 15,529 16,908 13,563 7,009 14,434 11,848 6,283 58,745 39,574 40,568
Provision for income taxes 5,043 6,496 6,875 5,501 3,152 5,691 4,784 2,580 23,915 16,207 16,841
Net earnings 7,702 9,033 10,033 8,062 3,857 8,743 7,064 3,703 34,830 23,367 23,727
Net earnings per common share - Basic (in dollars per share) $ 0.96 [1] $ 1.11 [1] $ 1.26 [1] $ 1.01 [1] $ 0.48 [1] $ 1.08 [1] $ 0.83 [1] $ 0.43 [1] $ 4.37 [1] $ 2.82 [1] $ 2.83
Net earnings per common share - Diluted (in dollars per share) $ 0.95 [1] $ 1.11 [1] $ 1.25 [1] $ 1.00 [1] $ 0.48 [1] $ 1.07 [1] $ 0.82 [1] $ 0.43 [1] $ 4.32 [1] $ 2.79 [1] $ 2.78
Scenario, Previously Reported [Member]
                      
Total revenues     260,051 244,724 218,999 224,028 203,655 178,899      
Total costs and expenses     243,143 231,161 211,990 209,594 191,807 172,616      
Earnings before provision for income taxes     16,908 13,563 7,009 14,434 11,848 6,283      
Provision for income taxes     6,875 5,501 3,152 5,691 4,784 2,580      
Net earnings     10,033 8,062 3,857 8,743 7,064 3,703      
Net earnings per common share - Basic (in dollars per share)     $ 1.29 [1] $ 1.04 [1] $ 0.50 [1] $ 1.12 [1] $ 0.87 [1] $ 0.45 [1]      
Net earnings per common share - Diluted (in dollars per share)     $ 1.27 [1] $ 1.02 [1] $ 0.49 [1] $ 1.10 [1] $ 0.85 [1] $ 0.44 [1]      
Adjustment [Member]
                      
Total revenues     0 0 0 0 0 0      
Total costs and expenses     0 0 0 0 0 0      
Earnings before provision for income taxes     0 0 0 0 0 0      
Provision for income taxes     0 0 0 0 0 0      
Net earnings     $ 0 $ 0 $ 0 $ 0 $ 0 $ 0      
Net earnings per common share - Basic (in dollars per share)     $ (0.03) [1] $ (0.03) [1] $ (0.02) [1] $ (0.04) [1] $ (0.04) [1] $ (0.02) [1]      
Net earnings per common share - Diluted (in dollars per share)     $ (0.02) [1] $ (0.02) [1] $ (0.01) [1] $ (0.03) [1] $ (0.03) [1] $ (0.01) [1]      
[1] Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.