Restructuring Liabilities (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring activities
Restructuring expense (income)	$ 687	$ (3,272)
Kendall Restructuring
Restructuring activities
Liability, beginning of the period	7,944	11,596
Cash payments	(3,931)	(3,985)
Cash received from subleases	3,008	2,476
Restructuring expense (income)	203	(581)
Liability, end of the period	7,224	9,506
Fan Pier Move Restructuring
Restructuring activities
Liability, beginning of the period	5,964	33,390
Cash payments	(3,156)	(19,256)
Cash received from subleases	2,408	0
Restructuring expense (income)	233	(2,997)
Liability, end of the period	5,449	11,137
Other Restructuring
Restructuring activities
Liability, beginning of the period	1,450	869
Cash payments	(439)	(330)
Restructuring expense (income)	251	306
Liability, end of the period	$ 1,262	$ 845