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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 21,470
Equity grants	7,627
Equity grant forfeitures	(112)
Equity compensation expense	(9,565)
Unrecognized Compensation Cost at End of Period	19,420
Incentive Plans | Restricted Stock
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	2,808
Equity grants	2,391
Equity grant forfeitures	(112)
Equity compensation expense	(1,245)
Unrecognized Compensation Cost at End of Period	3,842
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	13,364
Equity grants	4,750
Equity grant forfeitures	0
Equity compensation expense	(6,264)
Unrecognized Compensation Cost at End of Period	11,850
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	5,298
Equity grants	350
Equity grant forfeitures	0
Equity compensation expense	(1,954)
Unrecognized Compensation Cost at End of Period	3,694
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	136
Equity grant forfeitures	0
Equity compensation expense	(102)
Unrecognized Compensation Cost at End of Period	$ 34

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- Definition

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Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]

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- Definition

Represents the amount of equity grant forfeitures during the period.

+ References

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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=109197908&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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