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Equity Compensation Plans - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
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	6,088
Equity grant forfeitures	(122)
Equity compensation expense	(2,176)
Unrecognized Compensation Cost at End of Period	21,936
Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Equity compensation expense		$ (3,000)
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	2,234
Equity grant forfeitures	(122)
Equity compensation expense	(267)
Unrecognized Compensation Cost at End of Period	3,936
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	3,725
Equity grant forfeitures	0
Equity compensation expense	(1,298)
Unrecognized Compensation Cost at End of Period	13,933
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	0
Equity grant forfeitures	0
Equity compensation expense	(579)
Unrecognized Compensation Cost at End of Period	3,970
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	(32)
Unrecognized Compensation Cost at End of Period	$ 97

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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X

- 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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