Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Undistributed Earnings of Foreign Subsidiaries				$ 354,200
Income tax expense	$ 1,750	$ 2,397
Effective income tax rate	7.30%	11.60%	7.70%
Unrecognized Tax Benefits	$ 3,165			$ 3,115
Unrecognized tax benefits, period increase (decrease)	$ 50	$ 87
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%