Commitments and Contingencies Purchase Obligations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Contractual Obligation, Due in Next Twelve Months	$ 21,131
Contractual Obligation, Due in Second Year	6,049
Contractual Obligation, Due in Third Year	735
Contractual Obligation, Due in Fourth Year	360
Contractual Obligation, Due in Fifth Year	0
Contractual Obligation, Due after Fifth Year	0
Contractual Obligation	$ 28,275