Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Operating Leases (Details)

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Commitments and Contingencies - Operating Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leases, Rent Expense, Net [Abstract]      
Rental expense under operating lease arrangements $ 7,100,000 $ 7,100,000 $ 6,600,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2014 5,727,000    
2015 5,144,000    
2016 3,806,000    
2017 832,000    
2018 802,000    
Thereafter 1,700,000    
Total future minimum payments under noncancelable operating leases, net of subleases $ 18,011,000