Other (Expense) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Secondary Offering Underwriting Fees	$ 5,900	$ 0	$ 0
Foreign Currency Transaction Gain (Loss), before Tax	(3,958)	(3,379)	(7,055)
Gain (Loss) on Sale of Accounts Receivable	(801)	(1,017)	(1,866)
Gain on remeasurement of previously held equity interest	0	14,199	0
Gain on sale of investment in affiliate	0	0	1,882
Miscellaneous Income Expense	0	(44)	869
Other Nonoperating Income (Expense)	$ (10,659)	$ 9,759	$ (6,170)