Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			$ (28,704)
Other comprehensive income before reclassifications			5,316
Amounts reclassified from accumulated other comprehensive loss			1,209
Other comprehensive income (loss)	$ 2,155	$ (837)	6,525	$ 6,627
Distribution of the GoTo Business			13,400
Balance at June 30, 2017	(8,779)		(8,779)
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 June 30, 2017	(2,946)		(2,946)
Unrealized (Loss) Gain 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			1,440
Amounts reclassified from accumulated other comprehensive loss			(460)
Other comprehensive income (loss)			980
Distribution of the GoTo Business			0
Balance at June 30, 2017	(2,128)		(2,128)
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			3,876
Amounts reclassified from accumulated other comprehensive loss			1,678
Other comprehensive income (loss)			5,554
Distribution of the GoTo Business			0
Balance at June 30, 2017	2,424		2,424
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			(9)
Other comprehensive income (loss)			(9)
Distribution of the GoTo Business			0
Balance at June 30, 2017	$ (6,129)		$ (6,129)