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Stock Based Compensation - Summary of Non-Cash Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation	$ 46,994	$ 33,519	$ 30,631
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation	6,504	4,744	4,025
2010 SIP and 2019 SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation	39,626	28,027	24,899
Performance Stock​ Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation	$ 864	$ 748	$ 1,707

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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+ References

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