Restructuring and Other Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Charges	$ 0	$ 240	$ 0	$ 289
Employee severance and related costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning			1,147	2,202
Cash payments			849	1,009
Charges			0	72
Restructuring Reserve, Ending	298	1,265	298	1,265
Real estate exit and related costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning			3,314	2,935
Cash payments			1,032	1,020
Charges			0	217
Restructuring Reserve, Ending	2,282	2,132	2,282	2,132
Accrued restructuring liability
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning			4,461	5,137
Cash payments			1,881	2,029
Charges			0	289
Restructuring Reserve, Ending	2,580	$ 3,397	2,580	$ 3,397
Accrued restructuring liability | Other Current Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning			3,500
Restructuring Reserve, Ending	2,000		2,000
Accrued restructuring liability | Other Noncurrent Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning			1,000
Restructuring Reserve, Ending	$ 600		$ 600