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Derivative Financial Instruments - Effect of Cash Flow Derivatives on the Balance Sheet and Income Statement, Before Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Rate Swap Contracts [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | $ 2,507 | $ (916) | $ (1,322)
Interest Rate Swap [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | 1,306 | 768 | (1,163)
Interest Rate Swap [Member] | Interest Expense [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | 1,065 | (706) | (1,296)
Interest Rate Cap [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | 18 | (183) | (605)
Interest Rate Cap [Member] | Interest Expense [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (439) | (210) | (27)
Currency Swap 1 [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | 1,584 | 0 | 0
Currency Swap [Member] | Interest Expense [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | 949 | 0 | 0
Currency Swap [Member] | Other Income (Expense) [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | 932 | 0 | 0
Currency Swap 2 [Member] |  |  |
Interest Rate Swap Contracts [Abstract] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | $ 0 | $ 0 | $ 0

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724391-108580 + Details
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- Definition Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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