Restructuring Expense - Restructuring and Other Liability for 2003 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended				144 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2003	Dec. 31, 2015	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 1,524	$ 1,826	$ 2,128	$ (3,272)	$ 4,164	$ 40,843	$ (270)	$ 6,188	$ 2,206	$ 50,925	$ 40,521
2003 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									(116)	(2,937)	372	$ 91,824	$ 59,798
Cash Payments									(14,625)	(17,494)	(15,255)	(17,816)	(211,071)
Non-cash Expense												(4,482)
Liability as of December 31, 2003	$ 7,944				$ 11,596				$ 7,944	$ 11,596	$ 19,115	69,526	$ 7,944	$ 23,328
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