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Fair Value Measures (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 2,441,323	$ 2,392,456
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	2,542,896	2,518,308
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	0	0
ABL Facilities | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	36,200	40,800
ABL Facilities | Carrying Amount | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,432,252	1,263,833
ABL Facilities | Fair Value | Level 1 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
ABL Facilities | Fair Value | Level 2 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,468,500	1,304,612
ABL Facilities | Fair Value | Level 3 | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2025 Secured Notes | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	9,500	12,900
2025 Secured Notes | Carrying Amount | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	517,054	637,068
2025 Secured Notes | Fair Value | Level 1 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2025 Secured Notes | Fair Value | Level 2 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	558,501	694,876
2025 Secured Notes | Fair Value | Level 3 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2028 Secured Notes | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	8,000	8,400
2028 Secured Notes | Carrying Amount | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	492,017	491,555
2028 Secured Notes | Fair Value | Level 1 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0	0
2028 Secured Notes | Fair Value | Level 2 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	515,895	518,820
2028 Secured Notes | Fair Value | Level 3 | Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 0	$ 0

X

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

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X

- 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.

+ References

No definition available.

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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