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Debt (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity limit	$ 100,000,000.0
Maximum additional borrowing capacity	150,000,000.0
Letters of credit, amount outstanding	$ 3,900,000	$ 4,700,000
Maximum debt to adjusted EBITDA ratio	2.50
Minimum EBITDA to interest expense ratio	3.0
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.25%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage	0.375%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Federal Funds Effective Rate | Interest Option 1, Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate | Minimum
Line of Credit Facility [Line Items]
Additional spread on variable rate	0.50%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate | Maximum
Line of Credit Facility [Line Items]
Additional spread on variable rate	1.50%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate
Line of Credit Facility [Line Items]
Threshold for change in interest payment schedule, number of months	3 months
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity limit	$ 20,000,000.0
Lines Of Credit | Revolving Credit Facility Maturing August 2018 | Swing Line Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity limit	10,000,000.0
Insurance Notes Payable
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 7,600,000.0
Debt instrument, interest rate (as a percent)		1.90%
Total outstanding	$ 2,100,000	$ 6,900,000

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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