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Derivative and Hedging Activities (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 06, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, Cash Paid on Hedge | $ (20,400) |  |  |  | $ 0 | $ (20,430) |
Unrealized Gain (Loss) on Derivatives |  | $ 0 | $ (7,100) |  | 0 | (13,000) |
Derivative, Cash Received on Hedge |  |  |  | $ 15,900 |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net |  | 1,300 |  |  | 1,300 |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | $ (300) | 400 |  | $ (700) | 800 |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  | $ 300,000 | $ 400,000 |  | $ 300,000 |
Senior Unsecured Notes [Member] | 3.74% Notes Due 2028 [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Notes payable, effective interest rate |  |  |  | 3.74% |  |  | 3.74%
Senior Unsecured Notes [Member] | 3.67% Notes Due 2029 [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Notes payable, effective interest rate |  |  | 3.67% |  |  | 3.67% | 3.67%

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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