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Debt Debt (Schedule of Long Term Debt Maturities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Unsecured Debt | $ 400,000 |
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months | 1,187 |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two | 1,230 |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three | 121,279 |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four | 335,328 |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five | 476,379 |
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five | 358,867 |
Long-term Debt, Gross | 1,294,270 |
Debt Instrument, Unamortized Discount | (2,711) |
Less: unamortized loan costs | 9,884 | $ 10,453
Debt, Long-term and Short-term, Combined Amount | 1,281,675 | 1,145,497
Private Placement [Member] |  |
Unsecured Debt | 400,000 | $ 400,000
January 2023 [Member] |  |
Unsecured Debt | $ 125,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.99% |
November 2023 [Member] |  |
Unsecured Debt | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.99% |
September 2024 [Member] |  |
Unsecured Debt | $ 75,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.93% |
November 2025 [Member] |  |
Unsecured Debt | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.33% |
January 2027 [Member] |  |
Unsecured Debt | $ 100,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.51% |

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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=6879938&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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