Other Comprehensive Income (Loss) - Accumulated other comprehensive income (loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net	$ 781
Foreign currency translation adjustments	207
Other comprehensive income (loss) before reclassifications	3,899
Amounts reclassified from accumulated other comprehensive income (loss)	(3)
Accumulated other comprehensive income (loss), balance at end of period, net	4,884
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Foreign currency translation adjustments	207
Accumulated other comprehensive income (loss), balance at end of period, net	207
Unrealized/Recognized Gains (Losses)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net	781
Other comprehensive income (loss) before reclassifications	3,899
Amounts reclassified from accumulated other comprehensive income (loss)	(3)
Accumulated other comprehensive income (loss), balance at end of period, net	$ 4,677