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Derivative Instruments - Cash flow hedges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Effects of derivative instruments
Amount of Loss (Gain) Recognized in OCI on Derivatives (Effective Portion)	$ (260)	$ 1,616
Cash Flow Hedging
Effects of derivative instruments
Amount of Loss (Gain) Recognized in OCI on Derivatives (Effective Portion)	613	(1,031)
Amount of Gain (Loss) Recognized from Accumulated OCI into Income (Effective Portion)	203	(24)
Cash Flow Hedging | Interest rate contract
Effects of derivative instruments
Amount of Loss (Gain) Recognized in OCI on Derivatives (Effective Portion)	613	(1,031)
Cash Flow Hedging | Interest rate contract | Interest expense
Effects of derivative instruments
Amount of Gain (Loss) Recognized from Accumulated OCI into Income (Effective Portion)	$ 203	$ (24)

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+ References

No definition available.

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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=114867106&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=114867106&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

No definition available.

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