Fair Value Measurements Assets Measured on a Non-Recurring Basis (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Adjusted basis of inventory	$ 76	$ 1,975	$ 1,605	$ 3,876
Total losses	622	2,136	1,426	4,237
Initial basis of inventory	$ 698	$ 4,111	$ 3,031	$ 8,113