Restructuring Liabilities - Activity Related to Restructuring Liability (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring activities
Restructuring expense (income)	$ 9,999,000	$ 687,000
2003 Restructuring
Restructuring activities
Liability, beginning of the period	4,328,000	7,944,000
Restructuring expense (income)	485,000	203,000
Cash payments	(5,264,000)	(3,931,000)
Cash received from subleases	2,976,000	3,008,000
Liability, end of the period	2,525,000	7,224,000
Fan Pier Move Restructuring
Restructuring activities
Liability, beginning of the period	3,626,000	5,964,000
Restructuring expense (income)	296,000	233,000
Cash payments	(4,405,000)	(3,156,000)
Cash received from subleases	2,478,000	2,408,000
Liability, end of the period	1,995,000	5,449,000
Other Restructuring
Restructuring activities
Liability, beginning of the period		1,450,000
Restructuring expense (income)		251,000
Cash payments		(439,000)
Liability, end of the period	0	$ 1,262,000
Research and Development Restructuring
Restructuring activities
Liability, beginning of the period	0
Restructuring expense (income)	9,218,000
Cash payments	(3,258,000)
Asset impairments and other non-cash expense	(2,233,000)
Liability, end of the period	$ 3,727,000