Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			$ (28,704)
Other comprehensive income before reclassifications			6,163
Amounts reclassified from accumulated other comprehensive loss			474
Other comprehensive income (loss)	$ 112	$ (934)	6,637	$ 5,692
Distribution of the GoTo Business			13,400
Balance at September 30, 2017	(8,667)		(8,667)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(16,346)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			0
Distribution of the GoTo Business			13,400
Balance at September 30, 2017	(2,946)		(2,946)
Unrealized Loss on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(3,108)
Other comprehensive income before reclassifications			1,500
Amounts reclassified from accumulated other comprehensive loss			(340)
Other comprehensive income (loss)			1,160
Distribution of the GoTo Business			0
Balance at September 30, 2017	(1,948)		(1,948)
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(3,130)
Other comprehensive income before reclassifications			4,663
Amounts reclassified from accumulated other comprehensive loss			551
Other comprehensive income (loss)			5,214
Distribution of the GoTo Business			0
Balance at September 30, 2017	2,084		2,084
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(6,120)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			263
Other comprehensive income (loss)			263
Distribution of the GoTo Business			0
Balance at September 30, 2017	$ (5,857)		$ (5,857)