Face amount or stated value per share of common stock.

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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.

+ References

No definition available.

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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No definition available.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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Stockholders' Equity - Stock Repurchase Plan (Details) - USD ($)	1 Months Ended	9 Months Ended	36 Months Ended	37 Months Ended
	Feb. 07, 2018	Dec. 31, 2017	Dec. 31, 2017	Feb. 07, 2018	Oct. 31, 2017	Mar. 31, 2017	Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01			$ 0.01
2015 Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum stock repurchase amount approved by Board of Directors							$ 200,000,000
Remaining authorized repurchase amount					$ 65,294,000
2017 Stock Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum stock repurchase amount approved by Board of Directors					335,000,000
2015 And 2017 Stock Repurchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount		$ 375,607,000	$ 375,607,000		$ 400,294,000
Shares repurchased (in shares)		360,735	2,380,584
Repurchased stock value		$ 24,687,000	$ 159,393,000
Repurchased stock acquired average cost per share (in dollars per share)		$ 68.44	$ 66.96
Subsequent Event \| 2015 And 2017 Stock Repurchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount	$ 355,402,000			$ 355,402,000
Shares repurchased (in shares)	213,909			2,594,493
Repurchased stock value	$ 20,205,000			$ 179,598,000
Repurchased stock acquired average cost per share (in dollars per share)	$ 94.46			$ 69.22