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Debt - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 05, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 26, 2017	Apr. 11, 2017
Debt Instrument [Line Items]
Repayment of debt and revolving credit facility				$ 27,000,000	$ 100,000,000
Interest expense		$ 1,900,000	$ 1,600,000	5,700,000	4,600,000
Amortization of debt financing fees		600,000	$ 400,000	1,718,000	$ 1,192,000
Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Proceeds from lines of credit				0
Repayment of debt and revolving credit facility				27,000,000
Amortization of debt financing fees				1,718,000
Carrying amount of debt		190,000,000		190,000,000		$ 217,000,000
Fair value of debt		192,600,000		192,600,000
Wells Fargo Bank, National Association | Secured Debt | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 400,000,000
Annual capital expenditure limitation per Credit Agreement	35,000,000							$ 45,000,000
Maximum allowed non-permitted investments per Credit Agreement	10,000,000							$ 20,000,000
Deferred issuance cost, gross	$ 10,100,000
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Wells Fargo Bank, National Association | Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from lines of credit				0
Repayment of debt and revolving credit facility				14,500,000
Carrying amount of debt		20,000,000		20,000,000		34,500,000
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 200,000,000
Debt instrument, term (in years)	5 years
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Commitment fee, percentage	0.20%
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Commitment fee, percentage	0.35%
Wells Fargo Bank, National Association | Term Loan Facility
Debt Instrument [Line Items]
Proceeds from lines of credit				0
Repayment of debt and revolving credit facility				12,500,000
Carrying amount of debt		$ 170,000,000		$ 170,000,000		$ 182,500,000
Wells Fargo Bank, National Association | Term Loan Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 200,000,000						$ 315,000,000
Debt instrument, term (in years)	5 years
Principal periodic payment, percent, years one and two	5.00%
Principal periodic payment, percent, years three and four	10.00%
Principal periodic payment, percent, year five	15.00%
Wells Fargo Bank, National Association | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000
Wells Fargo Bank, National Association | Letter of Credit | Line of Credit | Minimum
Debt Instrument [Line Items]
Participation fee, percentage	1.50%
Wells Fargo Bank, National Association | Letter of Credit | Line of Credit | Maximum
Debt Instrument [Line Items]
Participation fee, percentage	2.25%
Wells Fargo Bank, National Association | Swing line loan, Sub-limit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000

X

- Definition

Annual capital expenditure limitation per Credit Agreement

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Line of Credit Facility, Periodic Payment, Principal, Percent, Years One And Two

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Line of Credit Facility, Periodic Payment, Principal, Percent, Years Three And Four

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- Definition

Long-term Line of Credit, Gross

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Maximum allowed non-permitted investments per Credit Agreement

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

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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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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