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Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) - Unsecured Debt [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 1,792,110 | $ 1,721,110
$600 million Unsecured Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured credit facility, maximum borrowing capacity | 600,000 | 600,000
Long-term Debt, Gross | 163,500 | 92,500
$350M 3.95% Guaranteed Notes due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 350,000 | $ 350,000
Debt instrument interest rate | 3.95% | 3.95%
Debt instrument maturity year | 2023 | 2023
$250.0M 4.10% Guaranteed Notes due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 250,000 | $ 250,000
Debt instrument interest rate | 4.10% | 4.10%
Debt instrument maturity year | 2024 | 2024
$450.0M 3.95% Guaranteed Notes due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 450,000 | $ 450,000
Debt instrument interest rate | 3.95% | 3.95%
Debt instrument maturity year | 2027 | 2027
$250M 4.55% Guaranteed Notes due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 250,000 | $ 250,000
Debt instrument interest rate | 4.55% | 4.55%
Debt instrument maturity year | 2029 | 2029

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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