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Stockholders' Equity - Summary of Certain Information With Respect to the Performance Share Awards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Expense	$ 500		$ 500
Performance Shares
Fair Value			13,359
Accrual			10,189
Expense	1,211	$ 1,301	4,981	$ 4,326
Performance Shares | January 1, 2018 - December 31, 2020
Fair Value			6,130
Accrual			3,568
Expense	547	268	2,433	791
Performance Shares | January 1, 2017 - December 31, 2019
Fair Value			7,229
Accrual			6,621
Expense	664	546	2,548	1,655
Performance Shares | January 1, 2016 - December 31, 2018
Fair Value			0
Accrual			0
Expense	0	487	0	1,880
Performance Shares | January 1, 2019 - December 31, 2021
Fair Value			4,829
Expense	$ 402	$ 0	$ 1,207	$ 0

X

- Definition

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

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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
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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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.

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