For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 1
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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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.

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Segments - Narrative (Details)	3 Months Ended								12 Months Ended
Segments - Narrative (Details)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment									2
Revenues	$ 160,983,000	$ 246,040,000	$ 292,601,000	$ 266,382,000	$ 246,892,000	$ 269,331,000	$ 332,322,000	$ 268,949,000	$ 966,006,000	$ 1,117,494,000	$ 447,517,000
Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues									0
Inter-segment allocation of interest expense									$ 0
Customer 1 \| Customer Concentration Risk \| Sales Revenue, Net
Segment Reporting Information [Line Items]
Concentration risk percentage									10.00%		13.00%
Customer 1 \| Customer Concentration Risk \| Accounts Receivable
Segment Reporting Information [Line Items]
Concentration risk percentage										10.00%
Customer 2 \| Customer Concentration Risk \| Sales Revenue, Net
Segment Reporting Information [Line Items]
Concentration risk percentage									10.00%