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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 25,122
Equity grants	8,474
Equity grant forfeitures	0
Equity compensation expense	(6,977)
Unrecognized Compensation Cost at End of Period	26,619
Incentive Plans | Restricted Stock Awards
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	3,498
Equity grants	0
Equity grant forfeitures	0
Equity compensation expense	(766)
Unrecognized Compensation Cost at End of Period	2,732
Incentive Plans | Restricted Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	74
Equity grants	3,483
Equity grant forfeitures	0
Equity compensation expense	(277)
Unrecognized Compensation Cost at End of Period	3,280
Incentive Plans | Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	14,489
Equity grants	4,831
Equity grant forfeitures	0
Equity compensation expense	(4,184)
Unrecognized Compensation Cost at End of Period	15,136
Incentive Plans | Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	7,061
Equity grants	0
Equity grant forfeitures	0
Equity compensation expense	(1,670)
Unrecognized Compensation Cost at End of Period	5,391
Employee Stock Purchase Plan
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	0
Equity grants	160
Equity grant forfeitures	0
Equity compensation expense	(80)
Unrecognized Compensation Cost at End of Period	$ 80

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- Definition

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+ References

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- Definition

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- Definition

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+ References

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- Definition

Amount of cost capitalized for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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