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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Cash Flows [Abstract]      
Net cash flows used by operating activities $ 89,971 $ 44,201 $ 57,673
Cash flows from investing activities:      
Capital expenditures (44,221) (34,475) (28,891)
Other assets (816) (488) (360)
Net cash provided (used) by investing activities (44,596) (25,988) (38,060)
Cash flows from financing activities:      
Proceeds from short-term financing 6,775 4,585 3,866
Payments on short-term financing (4,950) (3,781) (3,077)
Payments associated with induced conversion of 5.5% convertible debentures (558)    
Acquisitions of 5.5% convertible debentures   (2,494) (8,938)
Payments on other long-term debt (15,345) (8,909) (2,327)
Payments on loans secured by cash value of life insurance policies (84) (380)  
Purchases of treasury stock   (2,421) (3,200)
Proceeds from exercise of stock options 1,197 829 609
Excess income tax benefit associated with stock-based compensation 1,160 185 911
Dividends paid on preferred stocks (305) (305) (306)
Net cash provided (used) by financing activities 12,891 (12,644) (3,922)
Net increase (decrease) in cash and cash equivalents 57,983 5,207 15,535
Cash and cash equivalents at beginning of year 66,946 61,739 46,204
Cash and cash equivalents at end of year 124,929 66,946 61,739
Parent Company [Member]
      
Consolidated Statements of Cash Flows [Abstract]      
Net cash flows used by operating activities (5,558) (3,074) (4,899)
Cash flows from investing activities:      
Capital expenditures   (51) (99)
Payments received on notes receivable from a subsidiary     21,400
Other assets (283) (439) (283)
Net cash provided (used) by investing activities (283) (490) 21,018
Cash flows from financing activities:      
Proceeds from short-term financing 6,775    
Payments on short-term financing (1,129)    
Payments associated with induced conversion of 5.5% convertible debentures (558)    
Acquisitions of 5.5% convertible debentures 0 (2,494) (8,938)
Payments on other long-term debt     (1)
Payments on loans secured by cash value of life insurance policies   (380)  
Net change in due to/from subsidiaries 26,512 (7,430) (7,738)
Purchases of treasury stock   (2,421) (3,200)
Proceeds from exercise of stock options 1,197 829 609
Excess income tax benefit associated with stock-based compensation 1,160 185 806
Dividends paid on preferred stocks (305) (305) (306)
Net cash provided (used) by financing activities 33,652 (12,016) (18,768)
Net increase (decrease) in cash and cash equivalents 27,811 (15,580) (2,649)
Cash and cash equivalents at beginning of year 7,491 23,071 25,720
Cash and cash equivalents at end of year $ 35,302 $ 7,491 $ 23,071