Derivatives (Cash Flow Hedges - Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum Length of Time Hedged in Cash Flow Hedge	0 years		0 years
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 0	$ 0
Cash Flow Hedges | Foreign currency swaps
Derivatives in cash flow hedging relationships
Amount of Gains (Losses) Deferred in AOCI on Derivatives	(421,000)	(146,000)
Cash Flow Hedges | Net derivative gains (losses)
Derivatives in cash flow hedging relationships
Amount and Location of Gains (Losses) Reclassified from AOCI into Income (Loss)	0	0
Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives	$ 1,000	$ 0