Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Less: Deferred financing costs	$ (14,374)	$ (18,012)
Carrying Value
Fair Value of Financial Instruments
Debt	3,490,472	3,679,720
Less: Deferred financing costs	(14,374)	(18,012)
Debt, net of financing costs	3,476,098	3,661,708
Fair Value
Fair Value of Financial Instruments
Debt	$ 3,502,800	3,445,699
2.35% senior notes due September 2016
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	2.35%
2.35% senior notes due September 2016 \| Carrying Value
Fair Value of Financial Instruments
Debt		347,955
2.35% senior notes due September 2016 \| Fair Value
Fair Value of Financial Instruments
Debt		347,708
6.15% senior notes due February 2018
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	6.15%
6.15% senior notes due February 2018 \| Carrying Value
Fair Value of Financial Instruments
Debt	$ 828,176	921,162
6.15% senior notes due February 2018 \| Fair Value
Fair Value of Financial Instruments
Debt	$ 864,452	935,962
9.25% senior notes due January 2019
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	9.25%
9.25% senior notes due January 2019 \| Carrying Value
Fair Value of Financial Instruments
Debt	$ 303,489	339,607
9.25% senior notes due January 2019 \| Fair Value
Fair Value of Financial Instruments
Debt	$ 334,217	342,575
5.00% senior notes due September 2020
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.00%
5.00% senior notes due September 2020 \| Carrying Value
Fair Value of Financial Instruments
Debt	$ 669,463	683,839
5.00% senior notes due September 2020 \| Fair Value
Fair Value of Financial Instruments
Debt	$ 662,714	617,409
4.625% senior notes due September 2021
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	4.625%
4.625% senior notes due September 2021 \| Carrying Value
Fair Value of Financial Instruments
Debt	$ 694,808	698,628
4.625% senior notes due September 2021 \| Fair Value
Fair Value of Financial Instruments
Debt	$ 656,850	581,630
5.10% senior notes due September 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.10%
5.10% senior notes due September 2023 \| Carrying Value
Fair Value of Financial Instruments
Debt	$ 346,416	349,021
5.10% senior notes due September 2023 \| Fair Value
Fair Value of Financial Instruments
Debt	336,447	280,907
Term Loan Facility \| Carrying Value
Fair Value of Financial Instruments
Debt	325,000	325,000
Term Loan Facility \| Fair Value
Fair Value of Financial Instruments
Debt	325,000	325,000
Revolving Credit Facility \| Carrying Value
Fair Value of Financial Instruments
Debt	300,000
Revolving Credit Facility \| Fair Value
Fair Value of Financial Instruments
Debt	300,000
Commercial paper \| Carrying Value
Fair Value of Financial Instruments
Debt	23,000	8,000
Commercial paper \| Fair Value
Fair Value of Financial Instruments
Debt	23,000	8,000
Other \| Carrying Value
Fair Value of Financial Instruments
Debt	120	6,508
Other \| Fair Value
Fair Value of Financial Instruments
Debt	$ 120	$ 6,508

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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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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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- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ 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=6451184&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

No definition available.

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