Represents the weighted average interest rate for borrowings during the period.

No definition available.

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- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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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
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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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- Definition

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

+ References

+ Details

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- 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

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

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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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.

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

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Indebtedness - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended	9 Months Ended	12 Months Ended
Indebtedness - Narrative (Details) - USD ($) $ in Thousands	Jan. 13, 2017	Sep. 26, 2016	Mar. 11, 2016	Feb. 03, 2016	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 28, 2017
Debt Instrument [Line Items]
Unsecured revolving credit facility							$ 191,000	$ 465,000
Senior unsecured notes, net							2,565,908	2,403,439
Convertible senior unsecured notes							8,478	8,478
Proceeds from issuance of senior unsecured notes, net of discounts							$ 737,612	$ 0	$ 690,071
Senior Notes, due 2021 at 4.25%
Debt Instrument [Line Items]
Interest rate stated percentage							4.25%	4.25%
Senior Notes, due 2026 at 5.25%
Debt Instrument [Line Items]
Interest rate stated percentage							5.25%	5.25%
Senior Notes, due 2016 at 6.3%
Debt Instrument [Line Items]
Interest rate stated percentage			6.30%				6.30%	6.30%
Repurchased face amount			$ 275,000
Debt redeemed			$ 279,139
Gain (loss) on early extinguishment of debt						$ (70)
Senior Notes, due 2017 at 5.625%
Debt Instrument [Line Items]
Interest rate stated percentage		5.625%
Repurchased face amount		$ 300,000
Debt redeemed		$ 300,516
Gain (loss) on early extinguishment of debt					$ (158)
Unsecured revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility							$ 191,000
Unsecured revolving credit facility maximum borrowing capacity							$ 1,000,000
Basis spread on variable rate							0.20%
Interest rate (as a percent)							1.87%
Remaining borrowing capacity							$ 809,000
Weighted average interest rate for borrowings (as a percent)							1.60%	1.30%	1.25%
Unsecured term loan
Debt Instrument [Line Items]
Senior Notes outstanding							$ 400,000
Interest rate (as a percent)							1.82%
Weighted average interest rate for borrowings (as a percent)							1.68%	1.39%	1.36%
Unsecured revolving credit facility and term loan
Debt Instrument [Line Items]
Accordion feature, increase borrowing limit							$ 2,300,000
Senior notes
Debt Instrument [Line Items]
Senior Notes outstanding				$ 750,000
Senior unsecured notes, net							2,600,000
Proceeds from issuance of senior unsecured notes, net of discounts				731,506
Senior notes \| Senior Notes, due 2021 at 4.25%
Debt Instrument [Line Items]
Senior Notes outstanding				$ 400,000
Interest rate stated percentage				4.25%
Senior notes \| Senior Notes, due 2026 at 5.25%
Debt Instrument [Line Items]
Senior Notes outstanding				$ 350,000
Interest rate stated percentage				5.25%
Convertible senior notes, due 2027 at 3.8%
Debt Instrument [Line Items]
Convertible senior unsecured notes							$ 8,478
Subsequent event \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility										$ 60,000
Remaining borrowing capacity										$ 940,000
Subsequent event \| Senior notes
Debt Instrument [Line Items]
Senior Notes outstanding	$ 600,000
Proceeds from issuance of senior unsecured notes, net of discounts	594,244
Subsequent event \| Senior notes \| Senior Notes, due 2023 at 4.5%
Debt Instrument [Line Items]
Senior Notes outstanding	$ 200,000
Interest rate stated percentage	4.50%
Subsequent event \| Senior notes \| Senior Notes, due 2027 at 4.95%
Debt Instrument [Line Items]
Senior Notes outstanding	$ 400,000
Interest rate stated percentage	4.95%
London Interbank Offered Rate (LIBOR) \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate							1.10%
London Interbank Offered Rate (LIBOR) \| Unsecured term loan
Debt Instrument [Line Items]
Basis spread on variable rate							1.20%