Equity-Based Compensation - Summary of Status of Equity-Based Compensation Plans (Details)	6 Months Ended
Jun. 30, 2016 shares
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	1,500,000
Awards available for grant	517,990
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	3,400,000
Awards available for grant	256,562
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	6,500,000
Awards available for grant	78,947
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Awards available for grant	25,985
RSUs \| 2014 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	257,371
Vested and released - shares	48,339
RSUs \| 2009 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	170,442
Vested and released - shares	0
RSUs \| 2004 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	78,947
RSUs \| Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	25,985
Performance-Based Stock Options \| 2014 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	325,000
Performance and market-based RSU's \| 2014 Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding	351,300
Performance and market-based RSU's \| 2009 Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding	86,120

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

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

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