Debt Instrument, Discount Rate

No definition available.

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- Definition

Debt Instrument, Redemption Period Within Close Date

+ References

No definition available.

+ Details

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- Definition

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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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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Balance Type:	debit
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- Definition

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

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

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+ Details

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- Definition

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

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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.

+ References

No definition available.

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

+ Details

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

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

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Balance Type:	debit
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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.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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- Definition

The cash outflow for the settlement of obligation drawn 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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- Details

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Senior Notes (Details) - USD ($)		12 Months Ended
Senior Notes (Details) - USD ($)	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit		$ 189,400,000	$ 82,600,000	$ 96,100,000
Proceeds from the issuance of the 6.625% senior notes		320,125,000	0	0
Debt Instrument, Unamortized Discount		560,000
Accretion of discount on 6.625% senior notes		272,000	0	0
Amortization of debt issuance costs		$ 532,000	$ 820,000	$ 824,000
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt redemption price (percent)		100.00%
Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt redemption price (percent)		106.625%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		40.00%
Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		60.00%
Debt Instrument, Redemption Period Within Close Date		180 days
Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt redemption price (percent)		101.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit	$ 291,400,000
Debt Issuance Costs, Gross	1,400,000
Debt instrument interest rate (in percent)		6.625%
Debt instrument, term		89 months
Debt Instrument, Interest Rate During Period		6.87%	6.69%
Principal amount	325,000,000	$ 325,000,000
Proceeds from the issuance of the 6.625% senior notes	$ 320,100,000
Long-term debt, fair value		324,600,000
Debt Instrument, Discount Rate	1.50%
Debt Instrument, Unamortized Discount	$ 4,900,000
Interest expense		12,600,000
Accretion of discount on 6.625% senior notes		300,000
Amortization of debt issuance costs		$ 100,000