Debt instrument net leverage ratio.

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Debt instrument, net leverage ratio, threshold limit for commitment fee.

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No definition available.

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Debt instrument percentage of face value issued.

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No definition available.

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Line of credit facility expiration dates.

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Ratio of consolidated earnings before interest tax depreciation and amortization to consolidated interest expense.

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Ratio of indebtedness to earnings before interest tax depreciation and amortization.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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.

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No definition available.

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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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No definition available.

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Amount, after accumulated amortization, of debt discount.

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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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No definition available.

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Amount of the fee for available but unused credit capacity under the credit facility.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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No definition available.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt - Additional Information (Details) - USD ($)			3 Months Ended			12 Months Ended
Debt - Additional Information (Details) - USD ($)	Sep. 30, 2019	Dec. 08, 2016	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Drawn amount						$ 0	$ 0	$ 100,000,000
Unamortized issue discount						0	282,000
Cash and cash equivalents						131,920,000	$ 23,275,000
Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings						0
Outstanding letters of credit						200,000
Maximum \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 50,000,000.0		$ 50,000,000.0			$ 50,000,000.0
Loan Agreement \| Prior Senior Secured Credit Agreement
Debt Instrument [Line Items]
Drawn amount	0
Unamortized term loan issuance fees	0		0
Accrued commitment fees	$ 100,000
Amortized loan issuance fees			700,000
Loan Agreement \| Selling, General and Administrative Expenses \| Prior Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees			500,000
Loan Agreement \| Interest Expense, Net \| Prior Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees			$ 200,000
Loan Agreement \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis points	1.00%
Debt instrument, term	364 days
Prior Senior Secured Credit Agreement
Debt Instrument [Line Items]
Description of variable interest rate basis						Borrowings under the Prior Senior Secured Credit Facilities bore interest at a rate equal to, at our option, either (i) the adjusted Eurocurrency rate based on LIBOR for U.S. dollar deposits for loans denominated in dollars, EURIBOR for Euro deposits for loans denominated in Euros and the offer rate for any other currencies for loans denominated in such other currencies for the relevant interest period plus an applicable margin from 1.25% to 2.25% based on the total net leverage ratio from less than 1.50:1.00 to greater than 3.75:1:00, or (ii) an alternative base rate (determined by reference to the highest of (a) the prime commercial lending rate of the administrative agent, as established from time to time, (b) the Federal Funds Rate plus 0.50% and (c) the one-month adjusted Eurocurrency rate for loans in U.S. dollars plus 1.00%) plus an applicable margin from 0.25% to 1.25% based on the total net leverage ratio from less than 1.50:1.00 to greater than 3.75:1:00. The applicable margin as of December 31, 2018 was 1.25% for eurocurrency loans and 0.25% for base rate loans.
Ratio of consolidated funded indebtedness to consolidated EBITDA							4.00
Prior Senior Secured Credit Agreement \| Eurocurrency Rate
Debt Instrument [Line Items]
Debt instrument, basis points							1.25%
Prior Senior Secured Credit Agreement \| Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument, basis points							0.50%
Prior Senior Secured Credit Agreement \| One-Month Adjusted Eurocurrency Rate
Debt Instrument [Line Items]
Debt instrument, basis points							1.00%
Prior Senior Secured Credit Agreement \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis points							0.25%
Prior Senior Secured Credit Agreement \| Prior Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings							$ 0
Outstanding letters of credit							$ 200,000
Maximum borrowing capacity		$ 150,000,000.0
Expiration date		2021-12
Commitment fee percentage					0.375%
Total net leverage ratio limit to determine commitment fee							3.00
Undrawn capacity							$ 149,800,000
Prior Senior Secured Credit Agreement \| Prior Senior Secured Revolving Credit Facility \| Prior Senior Secured Credit Facilities - Scenario 1
Debt Instrument [Line Items]
Commitment fee percentage							0.50%
Prior Senior Secured Credit Agreement \| Prior Senior Secured Revolving Credit Facility \| Prior Senior Secured Credit Facilities - Scenario 2
Debt Instrument [Line Items]
Commitment fee percentage							0.375%
Prior Senior Secured Credit Agreement \| Prior Senior Secured Revolving Credit Facility \| Eurocurrency Rate
Debt Instrument [Line Items]
Interest rate applicable							3.77%
Prior Senior Secured Credit Agreement \| Minimum \| Eurocurrency Rate
Debt Instrument [Line Items]
Debt instrument, basis points							1.25%
Debt instrument, total net leverage ratio							3.75
Prior Senior Secured Credit Agreement \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis points							0.25%
Debt instrument, total net leverage ratio							3.75
Prior Senior Secured Credit Agreement \| Maximum
Debt Instrument [Line Items]
Ratio of consolidated funded indebtedness to consolidated EBITDA							4.50
Cash consideration							$ 25,000,000
Ratio of consolidated EBITDA to consolidated interest expense							3.00
Prior Senior Secured Credit Agreement \| Maximum \| Unrestricted
Debt Instrument [Line Items]
Cash and cash equivalents							$ 50,000,000
Prior Senior Secured Credit Agreement \| Maximum \| Foreign \| Unrestricted
Debt Instrument [Line Items]
Cash and cash equivalents							$ 25,000,000
Prior Senior Secured Credit Agreement \| Maximum \| Eurocurrency Rate
Debt Instrument [Line Items]
Debt instrument, basis points							2.25%
Debt instrument, total net leverage ratio							1.50
Prior Senior Secured Credit Agreement \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis points							1.25%
Debt instrument, total net leverage ratio							1.50
Prior Senior Secured Credit Agreement \| Prior Senior Secured Term Loan Facility
Debt Instrument [Line Items]
Unamortized term loan issuance fees		$ 800,000					$ 400,000
Maximum borrowing capacity		$ 165,000,000.0
Debt instrument percentage of face value issued		99.70%
Expiration date		2021-12
Unamortized issue discount		$ 500,000					$ 300,000
Prior Senior Secured Credit Agreement \| Prior Senior Secured Term Loan Facility \| Selling, General and Administrative Expenses
Debt Instrument [Line Items]
Unamortized term loan issuance fees				$ 300,000
Prior Senior Secured Credit Agreement \| Prior Senior Secured Term Loan Facility \| Interest Expense, Net
Debt Instrument [Line Items]
Amortization of debt discount				$ 200,000
Prior Senior Secured Credit Agreement \| Term Loan
Debt Instrument [Line Items]
Interest rate applicable							3.77%
Prior Senior Secured Credit Agreement \| Prior Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized term loan issuance fees		$ 1,600,000					$ 900,000