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Commitments (Details) (USD $)	12 Months Ended
Commitments (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments
Rent expense	$ 6,100,000	$ 5,800,000	$ 5,400,000
Future non-cancelable minimum payments under operating leases
2013	6,700
Total minimum lease payments	$ 6,700

The total of future contractually required payments on leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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