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Stockholders' Equity - Summary of Certain Information With Respect to the Performance Share Awards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Expense	$ 500		$ 500
Performance Shares
Fair Value			13,226
Accrual			8,979
Expense	2,392	$ 1,367	3,770	$ 3,025
Performance Shares | January 1, 2018 - December 31, 2020
Fair Value			6,065
Accrual			3,021
Expense	1,295	279	1,886	523
Performance Shares | January 1, 2017 - December 31, 2019
Fair Value			7,161
Accrual			5,958
Expense	1,097	509	1,884	1,109
Performance Shares | January 1, 2016 - December 31, 2018
Expense		579		1,393
Performance Shares | January 1, 2019 - December 31, 2021
Fair Value			4,829
Expense	$ 403	$ 0	$ 805	$ 0

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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