Basis of Presentation - Restructuring Related Activities (Details) - USD ($)  | 
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2016  | 
Sep. 30, 2015  | 
Dec. 31, 2015  | 
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| Restructuring Cost and Reserve [Line Items] | |||
| Restructuring expenses | $ 0 | $ 2,400,000 | $ 3,300,000 | 
| Severance costs | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Restructuring reserve | 600,000 | ||
| Other exit costs | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Restructuring reserve | $ 100,000 | $ 200,000 | |
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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