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Senior Notes (Details) - USD ($)			12 Months Ended
	Dec. 19, 2019	May 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit			$ 118,261,000	$ 189,400,000	$ 82,600,000
Debt instrument, term			77 months
Proceeds from the issuance of the 6.625% senior notes			$ 76,688,000	320,125,000	0
Debt Instrument, Unamortized Discount			319,000
Accretion of discount on senior notes			492,000	272,000	0
Amortization of debt issuance costs			$ 392,000	532,000	$ 820,000
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt redemption price (percent)			100.00%
Debt Instrument, Redemption Price, Percentage, Change Of Control			101.00%
Senior Note Two [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt redemption price (percent)			100.00%
Senior Note Two [Member] | 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%
Senior Note Two [Member] | 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
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 325,000,000	$ 400,000,000
Debt premium			1,688,000
Long-term debt, fair value			426,400,000
Interest expense			21,700,000	12,600,000
Accretion of discount on senior notes			500,000	$ 300,000
Amortization of debt issuance costs			$ 100,000
Senior Notes [Member] | Senior Note One [Member]
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit		291,400,000
Debt Issuance Costs, Gross		1,400,000
Principal amount		325,000,000
Proceeds from the issuance of the 6.625% senior notes		$ 320,100,000
Debt Instrument, Discount Rate		1.50%	6.87%
Debt Instrument, Unamortized Debt Issuance Costs				6.69%
Debt Instrument, Unamortized Discount			$ 4,900,000
Senior Notes [Member] | Senior Note Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Increase, Accrued Interest	$ 200,000
Debt Issuance Costs, Gross	1,000,000
Debt instrument interest rate (in percent)			6.625%
Principal amount	75,000,000		$ 400,000,000	$ 325,000,000
Proceeds from the issuance of the 6.625% senior notes	$ 76,900,000
Debt premium			$ 1,688,000	$ 0
Debt Instrument, Discount Rate			6.20%
Debt Instrument, Unamortized Debt Issuance Costs				6.88%

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