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Debt - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Oct. 30, 2017	Nov. 30, 2013	Oct. 31, 2013
Debt Instrument [Line Items]
Debt instrument, carrying value	$ 488,024,000	$ 518,711,000
Outstanding letters of credit	$ 16,500,000	13,600,000
Senior Notes
Debt Instrument [Line Items]
Face amount				$ 100,000,000.0	$ 300,000,000.0
Issuance price of par percent				103.25%
Debt stated interest rate	6.25%				6.25%
Debt instrument, carrying value	$ 400,000,000	400,000,000
Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	20,000,000.0
Line of credit facility, remaining borrowing capacity	$ 194,400,000
Percentage of borrowing base (as a percentage)	10.00%
Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity			$ 140,000,000.0
Line of credit facility, maximum borrowing capacity			300,000,000.0
Credit Facility | Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			25,000,000.0
Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			30,000,000.0
Credit Facility | Letter of Credit | Canadian Subsidiaries
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			3,000,000.0
2017 Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	4.50%
Unused capacity commitment fee percentage	0.375%
2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit accordion feature increase limit			$ 100,000,000.0
2017 Credit Facility | Credit Facility
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 299,400,000
Debt instrument, carrying value	89,000,000	$ 119,000,000
2017 Credit Facility | Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Line of credit outstanding	$ 16,000,000.0
Federal Funds Effective Swap Rate | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread	0.50%
London Interbank Offered Rate (LIBOR) | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread	1.00%
CDOR Rate | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread	1.00%
Debt Instrument, Redemption, Period One | Credit Facility
Debt Instrument [Line Items]
Minimum leverage ratio	0.0175
Maximum leverage ratio	0.0225
Debt Instrument, Redemption, Period Two | Credit Facility
Debt Instrument [Line Items]
Maximum leverage ratio	4.00
Debt Instrument, Redemption, Period Three | Credit Facility
Debt Instrument [Line Items]
Minimum leverage ratio	0.0200
Maximum leverage ratio	0.0150
Percentage of borrowing base (as a percentage)	50.00%
Debt Instrument, Redemption, Period Four | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Debt Instrument, Redemption, Period Five | Credit Facility
Debt Instrument [Line Items]
Maximum leverage ratio	4.00
Minimum | Credit Facility
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.00
Fixed charge coverage ratio consecutive days threshold	60 days
Minimum | Debt Instrument, Redemption, Period Five | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage	0.25%
Maximum | Debt Instrument, Redemption, Period Five | 2017 Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage	0.375%

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Debt Instrument, Fixed Charge Coverage Ratio

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Debt Instrument, Fixed Charge Coverage Ratio, Consecutive Days Threshold

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Debt Instrument, Issuance Price of Par, Percentage

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Debt Instrument, Maximum Leverage Ratio

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Debt Instrument, Minimum Leverage Ratio

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Line of Credit Facility, Accordion Feature, Increase Limit

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Percentage of Borrowing Base

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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

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

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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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Weighted average interest rate of debt outstanding.

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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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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the 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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