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Other Long-term Liabilities, Net (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2013
former_executive_officers
Mar. 31, 2012
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Other long-term liabilities, net [Member]
Dec. 31, 2012
Other long-term liabilities, net [Member]
Mar. 31, 2013
Split-Dollar Life Insurance Policies [Member]
Accrued Liabilities and Other Liabilities, Noncurrent [Line Items]              
Split dollar insurance policies, death benefits     $ 10,000,000 $ 5,000,000      
Number of former executive officers who had life insurance policies terminated 2            
Payments made for the termination of split-dollar life insurance policies 372,000 350,000         2,200,000
Net gain on termination of split-dollar life insurance policies 2,200,000            
Split dollar insurance liability, noncurrent         $ 10,100,000 $ 14,300,000