Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015	$ (28,527)
Other comprehensive income before reclassifications	6,321
Amounts reclassified from accumulated other comprehensive loss	1,143
Other comprehensive income	7,464	$ 818
Balance at March 31, 2016	(21,063)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015	(16,346)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	0
Balance at March 31, 2016	(16,346)
Unrealized Gain (Loss) on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015	(2,900)
Other comprehensive income before reclassifications	4,099
Amounts reclassified from accumulated other comprehensive loss	(22)
Other comprehensive income	4,077
Balance at March 31, 2016	1,177
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015	(2,255)
Other comprehensive income before reclassifications	2,222
Amounts reclassified from accumulated other comprehensive loss	1,165
Other comprehensive income	3,387
Balance at March 31, 2016	1,132
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015	(7,026)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	0
Balance at March 31, 2016	$ (7,026)