Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Debt (Bank Of America Line Of Credit) (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended	12 Months Ended
	Aug. 08, 2019	Oct. 31, 2016	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Contractual facility			$ 288,594	$ 252,929
US Bank Of America Line Of Credit [Member]
Debt Instrument [Line Items]
Maturity date		Oct. 31, 2019	Sep. 01, 2020	Oct. 31, 2019
Contractual facility		$ 5,000	$ 5,000	$ 5,000
Extension period	10 months
Subsequent Event [Member] \| US Bank Of America Line Of Credit [Member]
Debt Instrument [Line Items]
Maturity date	Sep. 01, 2020