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.

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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Employee Benefit Plan (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Percentage contribution from employees	4.00%
Employer Contribution on employee benefit plan	$ 2.5	$ 1.3	$ 0.6
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage contribution from employees	6.00%
First 4% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	25.00%
Percentage contribution from employees	4.00%
Second 2% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	50.00%
Percentage contribution from employees	2.00%
Between 4% and 6% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	50.00%
Between 4% and 6% of Employee Contribution [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage contribution from employees	4.00%
Between 4% and 6% of Employee Contribution [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage contribution from employees			6.00%
First 6% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution		50.00%
Percentage contribution from employees	6.00%
First 1% Percent of Contributions [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	100.00%
Percentage contribution from employees	1.00%
Next 5 % Percent of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	50.00%
Percentage contribution from employees	5.00%