Stockholders' Equity (Changes in accumulated other comprehensive loss by component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	$ (1,926)	$ (1,297)	$ (1,032)	$ (1,385)
Translation adjustments	168	(232)	(354)	(62)
Accumulated other comprehensive (loss) income, end of period	(2,020)	(1,061)	(2,020)	(1,061)
Gains and losses on cash flow hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	(536)	(337)	(164)	(255)
Other comprehensive loss before reclassifications	(491)	273	(1,322)	(482)
Amounts reclassified from accumulated other comprehensive loss to interest expense	373	318	1,122	848
Amounts reclassified from accumulated other comprehensive loss to loss on debt extinguishment and termination of derivative instruments	0	0	0	587
Tax benefit included in provision for income taxes	(144)	(123)	(434)	(567)
Total amounts reclassified from accumulated other comprehensive loss	229	195	688	868
Net current-period other comprehensive (loss) income	(262)	468	(634)	386
Accumulated other comprehensive (loss) income, end of period	(798)	131	(798)	131
Unrealized gains (losses), tax effects	309	(175)	831	313
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive (loss) income, beginning of period	(1,390)	(960)	(868)	(1,130)
Translation adjustments	168	(232)	(354)	(62)
Accumulated other comprehensive (loss) income, end of period	$ (1,222)	$ (1,192)	$ (1,222)	$ (1,192)