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Equity Compensation Plans - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period		$ 18,146
Equity grants		14,223
Equity grant forfeitures		(758)
Equity compensation expense		(10,141)
Unrecognized Compensation Cost at End of Period		21,470
Restricted Stock
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized Compensation Cost at End of Period		3,000
Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Equity compensation expense	$ (3,000)
Unrecognized Compensation Cost at End of Period		13,000
Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Equity compensation expense	$ (600)
Unrecognized Compensation Cost at End of Period		5,000
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		2,091
Equity grants		2,247
Equity grant forfeitures		(286)
Equity compensation expense		(1,244)
Unrecognized Compensation Cost at End of Period		2,808
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		11,506
Equity grants		8,797
Equity grant forfeitures		(472)
Equity compensation expense		(6,467)
Unrecognized Compensation Cost at End of Period		13,364
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		4,549
Equity grants		3,050
Equity grant forfeitures		0
Equity compensation expense		(2,301)
Unrecognized Compensation Cost at End of Period		5,298
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		129
Equity grant forfeitures		0
Equity compensation expense		(129)
Unrecognized Compensation Cost at End of Period		$ 0

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- Definition

Allocated Share-based Compensation Expense, Including Restructuring

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Represents the amount of equity grant forfeitures during the period.

+ References

No definition available.

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X

- 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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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