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Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 3,576	$ 39
Restructuring Reserve [Roll Forward]
Restructuring charges	0	3,576	39
2015 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Company estimate of the aggregate restructuring cost		3,000
Restructuring charges		3,576
noncashrestructuringexpectedcost		$ 1,000
Restructuring and Related Cost, Positions Eliminated [Abstract]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent		8.00%
Restructuring Reserve [Roll Forward]
Beginning balance	(1,228)	$ 0
Restructuring charges		3,576
Payments for Restructuring	(1,228)	(1,765)
Restructuring Reserve, Settled without Cash		(583)
Ending balance	0	(1,228)	0
2015 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2,993
Restructuring Reserve [Roll Forward]
Beginning balance	(1,228)	0
Restructuring charges		2,993
Payments for Restructuring	(1,228)	(1,765)
Restructuring Reserve, Settled without Cash		0
Ending balance	0	(1,228)	0
2015 Plan [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	0	0
Restructuring Costs and Asset Impairment Charges		583
Payments for Restructuring	0	0
Restructuring Reserve, Settled without Cash		(583)
Ending balance	$ 0	0	$ 0
2015 Plan [Member] | MID
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,400
Restructuring Reserve [Roll Forward]
Restructuring charges		1,400
2015 Plan [Member] | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,200
Restructuring Reserve [Roll Forward]
Restructuring charges		1,200
2015 Plan [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges		900
Restructuring Reserve [Roll Forward]
Restructuring charges		900
2015 Plan [Member] | RSD
Restructuring Cost and Reserve [Line Items]
Restructuring charges		100
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 100

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The expected non-cash restructuring related costs.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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Amount expected to be recognized in earnings for the specified restructuring cost.

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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