Accumulated Other Comprehensive Income - Schedules of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of Period	$ 20,017	$ 27,465
Other comprehensive income before reclassifications	(18,334)	(7,675)
Amounts reclassified from AOCI, net of tax	(2,077)	227
Total other comprehensive income (loss)	(20,411)	(7,448)
Ending of Period	(394)	20,017
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of Period	429	275
Other comprehensive income before reclassifications	98	215
Amounts reclassified from AOCI, net of tax	(56)	(61)
Total other comprehensive income (loss)	42	154
Ending of Period	471	429
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of Period	30,847	42,158
Other comprehensive income before reclassifications	(18,432)	(11,311)
Amounts reclassified from AOCI, net of tax	0	0
Total other comprehensive income (loss)	(18,432)	(11,311)
Ending of Period	12,415	30,847
Unrecognized Net Actuarial Loss and Service Credit
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of Period	(11,259)	(14,968)
Other comprehensive income before reclassifications	0	3,421
Amounts reclassified from AOCI, net of tax	(2,021)	288
Total other comprehensive income (loss)	(2,021)	3,709
Ending of Period	$ (13,280)	$ (11,259)