Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross of tax reclassifications	$ 0	$ 1,626
Net of tax reclassifications	0	975
Beginning balance	2,782	7,642
Current-period change, net of tax	68	(138)
Ending balance	2,850	7,504
Income tax expense (benefit) associated with current-period change	(187)	(252)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0	(8)
Current-period change, net of tax	17	9
Ending balance	17	1
Income tax expense (benefit) associated with current-period change	11	6
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2,101	1,675
Current-period change, net of tax	610	240
Ending balance	2,711	1,915
Income tax expense (benefit) associated with current-period change	175	(7)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	681	5,975
Current-period change, net of tax	(559)	(387)
Ending balance	122	5,588
Income tax expense (benefit) associated with current-period change	$ (373)	$ (251)