Debt - Footnotes (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Senior Notes \| 5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Stated interest rate	5.875%	5.875%
Debt issuance costs	$ 11,961,000	$ 12,649,000
Debt Instrument, Face Amount	$ 1,100,000,000
Term B Loans \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.84%	3.84%
Debt instrument, unamortized discount and debt issuance costs	$ 1,745,000	$ 1,900,000
Debt Instrument, Face Amount	$ 190,000,000	$ 190,000,000
Term C Loans \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.85%	3.85%
Debt instrument, unamortized discount and debt issuance costs	$ 20,929,000	$ 21,783,000
Debt Instrument, Face Amount	1,666,000,000	1,666,000,000
Revolving Credit Facility \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Long-term Line of Credit	0	0
Line of Credit Facility, Maximum Borrowing Capacity	$ 420,000,000	$ 420,000,000

Debt instrument, unamortized discount and debt issuance costs

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

+ References

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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.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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