Debt - Credit Facilities (Details)	12 Months Ended
Dec. 31, 2016 USD ($) instrument	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs on term loans	$ (5,692,000)	$ (5,563,000)
Unsecured Debt	1,169,308,000	1,169,437,000
Unsecured Debt, Gross	$ 1,175,000,000	1,175,000,000
Revolving Credit Facility and Term Loans \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread over variable interest rate basis	1.45%
Revolving Credit Facility and Term Loans \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread over variable interest rate basis	3.00%
The Revolver \| Standby Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000,000.0
Number of standby letters of credit that may be issued, minimum \| instrument	1
The Revolver \| Swingline Loans
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 40,000,000.0
Unsecured Debt \| $400 Million Term Loan Maturing 2021
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000
Interest Rate	2.95%
Unsecured Debt	$ 400,000,000	400,000,000
Unsecured Debt \| $400 Million Term Loan Maturing 2019
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000.0
Interest Rate	2.72%
Unsecured Debt	$ 400,000,000	400,000,000
Unsecured Debt \| $225 Million Term Loan Maturing 2019
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 225,000,000.0
Interest Rate	4.04%
Unsecured Debt	$ 225,000,000	225,000,000
Unsecured Debt \| $150 Million Term Loan Maturing 2022
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000.0
Interest Rate	3.43%
Unsecured Debt	$ 150,000,000	150,000,000
Revolving Credit Facility and Term Loans
Debt Instrument [Line Items]
Unsecured Debt	1,169,308,000	1,169,437,000
The Revolver \| The Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000.0
Additional maturity term	1 year
Interest Rate	2.27%
Remaining borrowing capacity	$ 400,000,000	300,000,000
Unsecured Debt	$ 0	0
The Revolver \| The Revolver \| Minimum
Debt Instrument [Line Items]
Unused facility fee percentage	0.20%
The Revolver \| The Revolver \| Maximum
Debt Instrument [Line Items]
Unused facility fee percentage	0.30%
Accounting Standards Update 2015-03
Debt Instrument [Line Items]
Unamortized deferred financing costs on the Revolver		8,100,000
Accounting Standards Update 2015-03 \| Prepaid Expenses and Other Current Assets
Debt Instrument [Line Items]
Unamortized deferred financing costs on the Revolver	$ 2,300,000	$ 800,000

Represents the additional maturity term of the debt instruments.

No definition available.

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- Definition

Represents the number of standby letters of credit that may be issued by the entity under the terms of the credit facility.

+ References

No definition available.

+ Details

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- Definition

Unamortized debt issuance costs on term loans

+ References

No definition available.

+ Details

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- Definition

The gross amount of unsecured debt at the balance sheet date

+ References

No definition available.

+ Details

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Period Type:	instant

- 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

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

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

+ Details

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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

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

+ 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 uncollateralized debt obligations (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
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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