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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Adjusted basis of inventory	$ 1,529	$ 1,583	$ 1,529	$ 1,901
Total losses	804	1,201	804	2,101
Initial basis of inventory	$ 2,333	$ 2,784	$ 2,333	$ 4,002