Summary of Significant Accounting Policies - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
7.75% Senior Notes due 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	7.75%
7.75% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	7.75%
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases	$ 70,382	$ 111,063
Warrants	8,358	0
Carrying Amount \| Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable	152,838	0
Carrying Amount \| 7.75% Senior Notes due 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	0	475,000
Carrying Amount \| 7.75% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	0	300,000
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases	70,382	111,063
Warrants	8,358	0
Fair Value \| Term Loan \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable	152,838	0
Fair Value \| 7.75% Senior Notes due 2019 \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	0	399,000
Fair Value \| 7.75% Senior Notes due 2022 \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 0	$ 238,500

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

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 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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