Fair Value Measurements (Derivative Summary) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 1,450
Ending balance	958	$ 1,450
Level 2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	1,450	742
Total fair value adjustments reported in earnings	(492)	708
Ending balance	$ 958	$ 1,450