Restructuring and Related Charges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Consulting and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 200
2015 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring and related charges liability as of period start		9,993
Restructuring charges		8,729	$ 15,097
Cash payments		(14,381)	(2,999)
Non-cash charges	[1]		(2,105)
Non-cash charges	[1]	67
Adjustments	[2]	(103)
Accrued restructuring and related charges liability as of period end		4,305	9,993
Restructuring Cost [Abstract]
Restructuring charges incurred		24,000
2015 Restructuring Plan [Member] | Severance and Other Employee-related Costs [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring and related charges liability as of period start		7,093
Restructuring charges		4,599	8,836
Cash payments		(7,414)	(825)
Non-cash charges	[1]		(918)
Non-cash charges	[1]	67
Adjustments	[2]	(103)
Accrued restructuring and related charges liability as of period end		4,242	7,093
2015 Restructuring Plan [Member] | Consulting and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring and related charges liability as of period start	[3]	2,900
Restructuring charges	[3]	4,130	5,074
Cash payments	[3]	(6,967)	(2,174)
Non-cash charges	[1],[3]		0
Non-cash charges	[1],[3]	0
Adjustments	[2],[3]	0
Accrued restructuring and related charges liability as of period end	[3]	63	2,900
2015 Restructuring Plan [Member] | Asset Retirements
Restructuring Reserve [Roll Forward]
Accrued restructuring and related charges liability as of period start		0
Restructuring charges		0	1,187
Cash payments		0	0
Non-cash charges	[1]		(1,187)
Non-cash charges	[1]	0
Adjustments	[2]	0
Accrued restructuring and related charges liability as of period end		0	0
2016 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		4,933
Cash payments		(747)
Non-cash charges	[4]	(287)
Accrued restructuring and related charges liability as of period end		3,899
Restructuring Cost [Abstract]
Restructuring and related cost, expected cost		6,000
2016 Restructuring Plan [Member] | Severance and Other Employee-related Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		4,697
Cash payments		(559)
Non-cash charges	[4]	(287)
Accrued restructuring and related charges liability as of period end		3,851
2016 Restructuring Plan [Member] | Consulting and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	[3],[5]	236
Cash payments	[3],[5]	(188)
Non-cash charges	[3],[4],[5]	0
Accrued restructuring and related charges liability as of period end	[3],[5]	$ 48
Lease Termination Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges			$ 400

[1] Non-cash charges consist primarily of share-based compensation costs as well as asset retirements.

[2] Adjustments resulted primarily from actual employee tax and benefit amounts differing from previous estimates.

[3] Consulting and other costs primarily consist of third-party consulting charges incurred in connection with the 2015 Restructuring Plan. Consulting and other costs also include approximately $0.2 million and $0.4 million of lease termination costs in 2016 and 2015, respectively.

[4] Non-cash charges consist of share-based compensation costs.

[5] Consulting and other costs consist of third-party consulting charges incurred in connection with the 2016 Restructuring Plan.