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Income Taxes (Details2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes      
Income tax expense (benefit) at the statutory rate $ 7,539 $ (13,278) $ 11,115
Changes resulting from-      
State income taxes, net of federal tax effect 1,011 (1,972) 924
Increase (decrease) in valuation allowance 455 3,431 (846)
Increase in contingency reserves 198 28 95
Increase (decrease) from noncontrolling interests 565 (118)  
Non-deductible expenses 481 386 452
Production activity deduction (378)   (391)
Goodwill impairment   9,223  
Purchase accounting adjustments (210) (2,992)  
Other 384 (171) (156)
Provision for income taxes $ 10,045 $ (5,463) $ 11,193