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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Stock-Based Compensation (Restricted Stock Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	Feb. 29, 2016	May 31, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Vesting Period				4 years
Stock-based compensation expense				$ 28,694	$ 30,584	$ 23,846
Unvested restricted stock awards
Number of Shares
Granted				525,000
Granted (in dollars per share)				$ 12.15
Unvested restricted stock awards \| Vesting, Requisite Service Conditions [Member]
Number of Shares
Unrecognized employee stock-based compensation				$ 6,400
Unrecognized employee stock-based compensation, period for recognition				2 years 5 months 1 day
Granted (in dollars per share)				$ 13.26	$ 16.75	$ 16.22
Fair value of restricted stock unit				$ 5,700	$ 9,800	$ 5,600
Unvested restricted stock awards \| Vesting, Market Conditions [Member]
Number of Shares
Unrecognized employee stock-based compensation				$ 500
Unrecognized employee stock-based compensation, period for recognition				4 years 5 months
Unvested restricted stock awards \| Vesting, Stock Price Performance [Member]
Number of Shares
Unrecognized employee stock-based compensation				$ 2,800
Unrecognized employee stock-based compensation, period for recognition				1 year 7 months 20 days
Granted (in dollars per share)	$ 11.07	$ 13.81
IPO [Member] \| Unvested restricted stock awards
Number of Shares
Granted			280,000
Granted (in dollars per share)			$ 13.15
Weighted average period			1 year 8 months 12 days