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Long-Term Debt - Additional Information (Details)		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 28, 2016 USD ($)	Sep. 30, 2016 USD ($) day $ / shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($)	Sep. 15, 2016 USD ($)	Feb. 23, 2016 USD ($)	Feb. 22, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Repurchase of senior unsecured debt					$ 435,907,000	$ 0
Gain (loss) on extinguishment of debt			$ (13,793,000)	$ 0	$ 4,865,000	0
Ownership percentage, guarantors (as percent)					100.00%
Deferred financing costs		$ 35,000,000	35,000,000		$ 35,000,000
Interest Expense [Member]
Debt Instrument [Line Items]
Amortization of deferred financing costs			2,100,000	1,600,000	6,200,000	5,000,000
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount		2,500,000,000	2,500,000,000		2,500,000,000
Line of credit facility, current borrowing capacity								$ 1,150,000,000.0	$ 1,525,000,000.0
Line of credit facility, amount outstanding		195,000,000	195,000,000		195,000,000
Outstanding letters of credit		12,300,000	12,300,000		12,300,000
Line of credit facility, remaining borrowing capacity		$ 942,700,000	$ 942,700,000		$ 942,700,000
Weighted average interest rate (as percent)		2.00%	2.00%		2.00%					1.90%
Commitment fee percentage					0.375%
Write-off of deferred financing costs			$ 0	0	$ 1,800,000	500,000
Line of Credit [Member] | Revolving Credit Facility [Member] | Other Assets [Member]
Debt Instrument [Line Items]
Deferred financing costs		$ 5,500,000	5,500,000		5,500,000
Line of Credit [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding		195,000,000	195,000,000		195,000,000
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount of debt extinguished	$ 362,400,000
Repurchase of senior unsecured debt	371,400,000				64,500,000
Debt issuance costs		$ 29,500,000	$ 29,500,000		$ 29,500,000					$ 35,416,000
Senior Unsecured Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		6.50%	6.50%		6.50%
Senior Unsecured Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		7.25%	7.25%		7.25%
Senior Unsecured Debt [Member] | Notes [Member]
Debt Instrument [Line Items]
Unsecured debt		$ 1,753,000,000	$ 1,753,000,000		$ 1,753,000,000
Senior Unsecured Debt [Member] | Notes [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Debt discount		92,900,000	92,900,000		92,900,000
Deferred financing costs		$ 29,500,000	$ 29,500,000		$ 29,500,000
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		7.25%	7.25%		7.25%
Debt redemption price (percent)					101.813%
Amount of debt extinguished	344,700,000				$ 1,000,000
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		6.50%	6.50%		6.50%
Amount of debt extinguished	2,200,000				$ 2,300,000
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		6.875%	6.875%		6.875%
Amount of debt extinguished	3,400,000				$ 59,500,000
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		2.625%	2.625%		2.625%
Debt issued		$ 300,000,000.0	$ 300,000,000.0		$ 300,000,000.0
Proceeds from convertible Debt		$ 291,900,000
Debt conversion rate per $1000 principal (in shares per $1000)		76.3650
Debt conversion price (in dollars per share) | $ / shares		$ 13.10	$ 13.10		$ 13.10
Debt instrument effective interest rate (percent)		8.97%	8.97%		8.97%
Estimated fair value of debt							$ 206,800,000
Debt discount		$ 92,877,000	$ 92,877,000		$ 92,877,000		$ 93,200,000			$ 0
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Debt issuance costs		5,400,000	5,400,000		5,400,000
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member] | Additional Paid-in-Capital [Member]
Debt Instrument [Line Items]
Debt issuance costs		$ 2,400,000	$ 2,400,000		$ 2,400,000
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)		6.875%	6.875%		6.875%
Amount of debt extinguished	$ 12,100,000				$ 21,800,000
Senior Unsecured Debt [Member] | Purchased Notes [Member]
Debt Instrument [Line Items]
Amount of debt extinguished					84,600,000
Gain (loss) on extinguishment of debt			$ (13,800,000)		4,900,000
Senior Unsecured Debt [Member] | Purchased Notes [Member] | Gain of Extinguishment of Debt [Member]
Debt Instrument [Line Items]
Write-off of deferred financing costs			$ 5,300,000	$ 0	$ 6,300,000	$ 0
Debt Conversion Scenario 1 [Member] | Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member]
Debt Instrument [Line Items]
Number of trading days | day		20
Number of consecutive trading days		30 days
Stock price relative to conversion price (percent)		130.00%
Debt Conversion Scenario 2 [Member] | Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member]
Debt Instrument [Line Items]
Number of trading days | day		5
Number of consecutive trading days		5 days
Stock price relative to product of sale price and conversion rate (percent)		98.00%

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Debt Instrument, Convertible, Threshold Percentage of Stock Price to Product of Stock Sale Price and Conversion Rate

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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Weighted average interest rate of debt outstanding.

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

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

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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No definition available.

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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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