Accumulated Other Comprehensive Loss (Summary Of Activity In Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (25,206)
Balance at end of period	(24,345)	$ (17,200)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(25,166)	(16,446)
Unrealized gain (loss)	830	(530)
Balance at end of period	(24,336)	(16,976)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(40)	(114)
Unrealized gain (loss)	11	(162)
Reclassified to interest expense	34	87
Income tax expense	(14)	(35)
Balance at end of period	$ (9)	$ (224)