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Share-Based Compensation - 2006 Equity Plan (Details)	12 Months Ended
	Dec. 31, 2016 shares
2006 Incentive Plan
Shares Using Fungibility Ratio
Maximum shares of common stock issuable	4,874,000
Shares initially reserved for issuance	500,000
Shares available for grant	60,221
2006 Incentive Plan | On or after April 30, 2010
Share-based compensation
Fungibility ratio (as a percent)	1.83%
2006 Incentive Plan | Shares approved in 2008
Shares Using Fungibility Ratio
Maximum shares of common stock issuable	210,000
2006 Incentive Plan | Shares approved in 2010
Shares Using Fungibility Ratio
Maximum shares of common stock issuable	1,464,000
2006 Incentive Plan | Shares approved in 2012
Shares Using Fungibility Ratio
Maximum shares of common stock issuable	2,500,000
Cancellation of restricted shares or units increase (decrease), available for grant	800,000
1998 Plan
Shares Using Fungibility Ratio
Shares available for grant	1,000,000

X

- Definition

Represents the rate at which each share of the entity's common stock that is underlying any award other than a stock option counts against the maximum number of shares issuable under the share-based compensation plan.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options that were cancelled and thus add back to the total shares issuable for purposes of the fungibility ratio.

+ References

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- Definition

Represents the number of shares initially reserved for issuance under the share-based compensation plan.

+ References

No definition available.

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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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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-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.

+ 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

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