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Number of institutional investors that purchased debt in a private placement offering.

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

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

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Face (par) amount of the original debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, before 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. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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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.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Debt and Credit Agreements - Narrative (Details)			1 Months Ended						3 Months Ended	12 Months Ended
Debt and Credit Agreements - Narrative (Details)	Dec. 31, 2015 USD ($) fiscal_period	Apr. 17, 2015 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2014 USD ($) Investor Tranche	Dec. 31, 2010 USD ($) Investor Tranche	Dec. 31, 2008 USD ($) Investor	Jul. 31, 2008 USD ($) Investor Tranche	Jul. 31, 2001 USD ($) Investor Tranche	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) fiscal_period	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 19, 2016 USD ($)	Apr. 18, 2016 USD ($)
Debt Instrument [Line Items]
2018										$ 304,000,000
2020										87,000,000
2021										188,000,000
Repayments of debt										587,000,000	$ 604,000,000	$ 1,427,000,000
Loss on repurchase of debt										4,709,000	0	$ 0
Deferred financing costs capitalized	$ 8,861,000									7,470,000	8,861,000
Long-term debt including unamortized debt issuance costs	$ 2,025,000,000									$ 1,528,000,000	$ 2,025,000,000
7.33% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	7.33%									7.33%	7.33%
Long-term debt including unamortized debt issuance costs	$ 20,000,000									$ 0	$ 20,000,000
6.51% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	6.51%									6.51%	6.51%
Long-term debt including unamortized debt issuance costs	$ 425,000,000									$ 361,000,000	$ 425,000,000
9.78% senior notes
Debt Instrument [Line Items]
Interest rate (as a percent)	9.78%									9.78%	9.78%
Long-term debt including unamortized debt issuance costs	$ 67,000,000									$ 67,000,000	$ 67,000,000
5.58% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	5.58%									5.58%	5.58%
Long-term debt including unamortized debt issuance costs	$ 175,000,000									$ 175,000,000	$ 175,000,000
3.65% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	3.65%									3.65%	3.65%
Long-term debt including unamortized debt issuance costs	$ 925,000,000									$ 925,000,000	$ 925,000,000
Revolving credit facility
Debt Instrument [Line Items]
Remaining borrowing capacity on line of credit										$ 1,700,000,000
Minimum required asset coverage ratio										1.75
Fiscal quarters for reduction in coverage ratio \| fiscal_period										4
Minimum required annual coverage ratio										2.8
Maximum borrowing capacity on line of credit													$ 3,200,000,000.0	$ 3,400,000,000.0
Available line of credit		$ 1,800,000,000
Minimum current ratio										1.0
Debt issuance costs	1,100,000	$ 7,800,000									1,100,000
Long-term debt including unamortized debt issuance costs	$ 413,000,000									$ 0	$ 413,000,000
Interest rate during period										2.30%	2.20%	2.20%
Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Fiscal quarters for reduction in coverage ratio \| fiscal_period										4
Minimum required annual coverage ratio										2.8
Deferred financing costs capitalized										$ 1,900,000
Senior Notes \| 7.33% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)										7.33%
Principal								$ 170,000,000
Number of institutional investors \| Investor								7
Number of debt tranches \| Tranche								3
Principal repaid										$ 170,000,000
Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Principal							$ 425,000,000
Number of institutional investors \| Investor							41
Number of debt tranches \| Tranche							3
Senior Notes \| 9.78% senior notes
Debt Instrument [Line Items]
Principal						$ 67,000,000
Number of institutional investors \| Investor						4
Term						10 years
Interest rate (as a percent)						9.78%
Senior Notes \| 5.58% weighted-average senior notes
Debt Instrument [Line Items]
Principal					$ 175,000,000
Number of institutional investors \| Investor					8
Number of debt tranches \| Tranche					3
Senior Notes \| 3.65% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)				3.65%
Deferred financing costs capitalized				$ 5,600,000
Principal				$ 925,000,000
Number of institutional investors \| Investor				24
Number of debt tranches \| Tranche				3
Revolving credit facility
Debt Instrument [Line Items]
Remaining borrowing capacity on line of credit													$ 1,600,000,000
Minimum required asset coverage ratio	1.75
Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Unused capacity fee percentage		0.30%
Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Unused capacity fee percentage		0.50%
December 31, 2016 \| Senior Notes
Debt Instrument [Line Items]
Maximum leverage coverage ratio	4.75
December 31, 2016 \| Revolving credit facility
Debt Instrument [Line Items]
Maximum leverage coverage ratio	4.75
December 31, 2017 \| Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.25
Maximum leverage coverage ratio	4.25
December 31, 2017 \| Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.25
Maximum leverage coverage ratio	4.25
March 31, 2018 \| Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Maximum leverage coverage ratio	3.50
March 31, 2018 \| Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Maximum leverage coverage ratio	3.50
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Senior Notes
Debt Instrument [Line Items]
Maximum leverage coverage ratio	3.0
Fiscal quarters for reduction in coverage ratio \| fiscal_period	2
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Revolving credit facility
Debt Instrument [Line Items]
Maximum leverage coverage ratio	3.0									3.0
Fiscal quarters for reduction in coverage ratio \| fiscal_period	2									2
Increase in rate based upon coverage and leverage ratio \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate										0.00%
Increase in rate based upon coverage and leverage ratio \| Minimum \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate										0.00%
Increase in rate based upon coverage and leverage ratio \| Maximum \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate										1.25%
Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Amount of principal repurchased			$ 64,000,000
Repayments of debt			68,300,000
Loss on repurchase of debt									$ 4,700,000
Tranche 1 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Principal							$ 245,000,000
Term							10 years
Interest rate (as a percent)							6.44%
Tranche 1 \| Senior Notes \| 5.58% weighted-average senior notes
Debt Instrument [Line Items]
Principal					$ 88,000,000
Term					10 years
Interest rate (as a percent)					5.42%
Tranche 1 \| Senior Notes \| 3.65% weighted-average senior notes
Debt Instrument [Line Items]
Principal				$ 100,000,000
Term				7 years
Interest rate (as a percent)				3.24%
Tranche 1 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Amount of principal repurchased			8,000,000
Tranche 2 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Principal							$ 100,000,000
Term							12 years
Interest rate (as a percent)							6.54%
Tranche 2 \| Senior Notes \| 5.58% weighted-average senior notes
Debt Instrument [Line Items]
Principal					$ 25,000,000
Term					12 years
Interest rate (as a percent)					5.59%
Tranche 2 \| Senior Notes \| 3.65% weighted-average senior notes
Debt Instrument [Line Items]
Principal				$ 575,000,000
Term				10 years
Interest rate (as a percent)				3.67%
Tranche 2 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Amount of principal repurchased			13,000,000
Tranche 3 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Principal							$ 80,000,000
Term							15 years
Interest rate (as a percent)							6.69%
Tranche 3 \| Senior Notes \| 5.58% weighted-average senior notes
Debt Instrument [Line Items]
Principal					$ 62,000,000
Term					15 years
Interest rate (as a percent)					5.80%
Tranche 3 \| Senior Notes \| 3.65% weighted-average senior notes
Debt Instrument [Line Items]
Principal				$ 250,000,000
Term				12 years
Interest rate (as a percent)				3.77%
Tranche 3 \| Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Amount of principal repurchased			$ 43,000,000
LIBOR \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate										0.50%
LIBOR \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate										3.00%
LIBOR \| Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate										0.50%
LIBOR \| Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate										2.25%