Derivatives - Schedule Of Derivative Financial Instruments Designated As Cash Flow Hedges (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	$ (273)	$ (529)	$ (249)	$ (929)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0	0	0
Derivative Effective Date March 15, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	(74)	(168)	(61)	(232)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0	0	0
Derivative Effective Date December 15, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	(31)	(53)	(23)	(150)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0	0	0
Derivative Effective Date June 15, 2017 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	(46)	(68)	(45)	(182)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0	0	0
Derivative Effective Date December 15, 2017 Contract 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	(81)	(165)	(80)	(236)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0	0	0
Derivative Effective Date December 15, 2017 Contract 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivatives, net of Tax (Effective Portion)	(41)	(75)	(40)	(129)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	$ 0	$ 0	$ 0	$ 0

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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