Accumulated OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Changes in accumulated OCI, net of tax [Roll Forward]
Other comprehensive income (loss) before reclassifications, net of tax			$ (569)
Amounts reclassified from accumulated OCI, net of tax			306
Total other comprehensive income (loss), net of tax	$ 4,502		(263)	$ (2,191)
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in accumulated OCI, net of tax [Roll Forward]
Balance	(4,502)		(4,239)
Balance			(4,502)	(4,239)
Net Change in Fair Value of Interest Rate Swaps [Member]
Changes in accumulated OCI, net of tax [Roll Forward]
Balance	0		(239)
Other comprehensive income (loss) before reclassifications, net of tax			(67)
Amounts reclassified from accumulated OCI, net of tax			306
Total other comprehensive income (loss), net of tax			239
Balance			0	(239)
Other comprehensive income (loss) before reclassifications, tax			44
Amounts reclassified from accumulated OCI, tax			201
Foreign Currency Translation Adjustments [Member]
Changes in accumulated OCI, net of tax [Roll Forward]
Balance	(4,502)		(4,000)
Other comprehensive income (loss) before reclassifications, net of tax	1,458		(502)
Amounts reclassified from accumulated OCI, net of tax	3,044	[1]	0
Total other comprehensive income (loss), net of tax			(502)
Balance	0		(4,502)	$ (4,000)
Other comprehensive income (loss) before reclassifications, tax	225		0
Amounts reclassified from accumulated OCI, tax	$ 0		$ 0

[1] This amount was reclassified out of accumulated OCI to gain (loss) on discontinued operations during the year ended December 31, 2017 and had a tax effect of $0.