Fair Value Disclosures (Changes in Level 3 liabilities measured at fair value on a recurring basis) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value at December 31, 2011	$ 14,104
Change in estimate	(2,737)
Accretion expense	648
Foreign exchange	(228)
Fair Value at March 31, 2012	$ 11,787