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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 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	5,966
Equity grant forfeitures	0
Equity compensation expense	(2,697)
Unrecognized Compensation Cost at End of Period	24,739
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	2,380
Equity grant forfeitures	0
Equity compensation expense	(353)
Unrecognized Compensation Cost at End of Period	4,835
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	3,450
Equity grant forfeitures	0
Equity compensation expense	(1,673)
Unrecognized Compensation Cost at End of Period	15,141
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	0
Equity grant forfeitures	0
Equity compensation expense	(637)
Unrecognized Compensation Cost at End of Period	4,661
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	(34)
Unrecognized Compensation Cost at End of Period	$ 102

X

- 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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- 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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