Commitments and Contingencies Schedule of Future Lease Payments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Operating Leased Assets [Line Items]
2012	3,426
2013	2,746
2014	1,998
2015	1,647
2016	1,532
Thereafter	4,995
Future Minimum Payments	16,344
Minimum [Member]
Operating Leased Assets [Line Items]
Operating Lease, Term	1
Maximum [Member]
Operating Leased Assets [Line Items]
Operating Lease, Term	10

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

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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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- Definition

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

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