Restructuring Expenses - Restructuring and Other Liability for 2003 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended				36 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2003	Dec. 31, 2016	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 224	$ 8	$ 343	$ 687	$ 1,524	$ 1,826	$ 2,128	$ (3,272)	$ 1,262	$ 2,206	$ 50,925
2003 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									333	(116)	(2,937)	$ 91,824	$ 60,131
Cash Payments									(15,841)	(14,625)	(17,494)	(17,816)	(226,912)
Non-cash Expense												(4,482)
Liability as of December 31, 2003	$ 4,328				$ 7,944				$ 4,328	$ 7,944	$ 11,596	69,526	$ 4,328	$ 19,115
2003 Restructuring | Lease restructuring and other operating lease expense
Restructuring Cost and Reserve [Line Items]
Restructuring expenses												84,726
Cash Payments												(15,200)
Non-cash Expense												0
Liability as of December 31, 2003												69,526
2003 Restructuring | Employee severance, benefits and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses												2,616
Cash Payments												(2,616)
Non-cash Expense												0
Liability as of December 31, 2003												0
2003 Restructuring | Leasehold improvements and asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses												4,482
Cash Payments												0
Non-cash Expense												(4,482)
Liability as of December 31, 2003												$ 0