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Employee Benefit Plans (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2004	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense		$ 0	$ 1,700,000	$ 1,900,000
Deferred compensation liability		$ 26,800,000	31,100,000
Executive Deferred Compensation Plan | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (years)	5 years
401(k) Savings and Investment Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (years)		1 month
Maximum annual contributions per employee (percent)		100.00%
Employer discretionary contribution (percent)		50.00%
Cost recognized		$ 3,700,000	$ 3,800,000	$ 3,400,000
401(k) Savings and Investment Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer discretionary contribution percent (percent)		4.00%
401(k) Savings and Investment Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (percent)		3.00%
Employer discretionary contribution percent (percent)		6.00%

X

- Definition

Defined Contribution Plan Employer Discretionary Contribution

+ References

No definition available.

+ Details

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X

- Definition

The percentage of eligible compensation matched by the employer for plans.

+ References

No definition available.

+ Details

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X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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Period Type:	duration

X

- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, 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
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Details

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