Debt (Credit Facilities) (Details) - USD ($)	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Debt
Term Loans and Revolver, net	$ 1,168,439,000	$ 1,169,437,000
Term Loans and Revolver, gross	1,175,000,000	1,175,000,000
Unamortized debt issuance costs on term loans	(6,561,000)	(5,563,000)
The Revolver \| Line of Credit
Debt
Maximum borrowing capacity	$ 400,000,000
Additional maturity term	1 year
Term Loans and Revolver, net	$ 0	0
Interest Rate	1.97%
Remaining borrowing capacity	$ 400,000,000	300,000,000
$400 Million Term Loan Maturing 2019 \| Unsecured Debt
Debt
Maximum borrowing capacity	$ 400,000,000
Maturity term	5 years
Term Loans and Revolver, net	$ 400,000,000	400,000,000
Interest Rate	2.72%
$225 Million Term Loan Maturing 2019 \| Unsecured Debt
Debt
Maximum borrowing capacity	$ 225,000,000
Maturity term	7 years
Term Loans and Revolver, net	$ 225,000,000	225,000,000
Interest Rate	4.04%
$400 Million Term Loan Maturing 2021 \| Unsecured Debt
Debt
Maximum borrowing capacity	$ 400,000,000
Maturity term	5 years
Term Loans and Revolver, net	$ 400,000,000	400,000,000
Interest Rate	2.91%
$150 Million Term Loan Maturing 2022 \| Unsecured Debt
Debt
Maximum borrowing capacity	$ 150,000,000.0
Maturity term	7 years
Term Loans and Revolver, net	$ 150,000,000	$ 150,000,000
Interest Rate	3.43%

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No definition available.

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- Definition

Unamortized debt issuance costs on term loans

+ References

No definition available.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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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=6451184&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

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.

+ References

No definition available.

+ Details

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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

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: 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

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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