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Derivative Instruments - Cash flow hedges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Effects of derivative instruments
Amount of Loss Recognized in OCI on Derivatives (Effective Portion)	$ (3,539)	$ (260)
Cash Flow Hedging
Effects of derivative instruments
Amount of Loss Recognized in OCI on Derivatives (Effective Portion)	3,318	613
Amount of Loss (Gain) Reclassified from Accumulated OCI into Income (Effective Portion)	36	(203)
Cash Flow Hedging | Interest rate contracts
Effects of derivative instruments
Amount of Loss Recognized in OCI on Derivatives (Effective Portion)	3,318	613
Cash Flow Hedging | Interest rate contracts | Interest expense
Effects of derivative instruments
Amount of Loss (Gain) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 36	$ (203)

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in 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=118930883&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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- Definition

The effective portion of gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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