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Revision of Quarterly Information - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended	24 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative impact on retained earnings	$ 1,332,312	$ 1,616,595		$ 1,402,908	$ 1,440,299	$ 1,606,955	$ 1,600,638	$ 1,838,601
Adjustments on retained earnings	7,400	$ (2,300)	$ (10,300)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative impact on retained earnings	$ (5,240)				$ (5,240)	$ (7,388)	$ (7,388)	$ (10,356)

X

- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
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The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(4))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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