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Long-Term Debt Shelf Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Long-term Debt | $ (327,200) | $ (205,200)
Debt Instrument, Unused Borrowing Capacity, Amount | 250,000 |
Prudential [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | 150,000 |
Long-term Debt | (70,000) |
Debt Instrument, Unused Borrowing Capacity, Amount | 50,000 |
MetLife [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Unused Borrowing Capacity, Amount | 150,000 |
New York Life [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | 100,000 |
Debt Instrument, Unused Borrowing Capacity, Amount | 50,000 |
Aggregate Shelf Agreements [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term Debt | (170,000) |
Aggregated Unfunded Commitments [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term Debt | (100,000) |
Uncollateralized Senior Note to be Issued in 2019 [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term Debt | $ (100,000) |
Debt Instrument, Interest Rate, Stated Percentage | 3.98% |
New York Life [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term Debt | $ (100,000) |
Uncollateralized Senior Note Due April Two Thousand Thirty Two [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term Debt | (70,000) | $ (70,000)
Maximum [Member] | Prudential [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | 220,000 |
Maximum [Member] | MetLife [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | 150,000 |
Maximum [Member] | New York Life [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | 150,000 |
Maximum [Member] | Aggregate Shelf Agreements [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | $ 520,000 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 Reference 4: 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 + Details
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