Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016	$ (28,704)
Other comprehensive income before reclassifications	3,082
Amounts reclassified from accumulated other comprehensive loss	1,288
Other comprehensive income	4,370	$ 7,464
Distribution of the GoTo Business	13,400
Balance at March 31, 2017	(10,934)
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	0
Distribution of the GoTo Business	13,400
Balance at March 31, 2017	(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	1,089
Amounts reclassified from accumulated other comprehensive loss	(375)
Other comprehensive income	714
Distribution of the GoTo Business	0
Balance at March 31, 2017	(2,394)
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	1,993
Amounts reclassified from accumulated other comprehensive loss	1,672
Other comprehensive income	3,665
Distribution of the GoTo Business	0
Balance at March 31, 2017	535
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	(9)
Distribution of the GoTo Business	0
Balance at March 31, 2017	$ (6,129)