Long-Term Debt and Interest Expense - Narrative (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Term Loan
Debt Instrument [Line Items]
Debt instrument, unamortized discount	$ 10,800,000
Borrowings	163,763,000	$ 164,175,000
Modified Facility
Debt Instrument [Line Items]
Borrowings	0
Letters of credit outstanding	51,600,000
Available borrowing capacity	23,400,000
Capital Lease Obligations, Long-term
Debt Instrument [Line Items]
Debt instrument, unamortized discount	5,200,000
Capital Lease Obligations, Short-term
Debt Instrument [Line Items]
Debt instrument, unamortized discount	$ 1,500,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28567-108399

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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