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Debt (Details Textual) |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 23, 2016 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2020 | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 | Mar. 12, 2019 USD ($) | May 03, 2016 USD ($)
Debt [Line Items] |  |  |  |  |  |  |  |
Amount of letters of credit outstanding |  |  |  | $ 18,576,000 | $ 4,836,000 |  |  |
Wells Fargo Capital Finance, LLC | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 250,000,000
Senior Notes | 6.50% Notes due 2024 |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 900,000,000 |  |  |  |  |  |  |
Interest rate, stated percentage | 6.50% |  |  |  |  | 6.50% |  |
Debt Acquired |  | $ 29,744,000 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 73.90% |  |  |  |  |  |
Long-term Debt |  | $ 21,999,000 |  |  |  |  |  |
Long-term Debt, Accrued Interest |  | 946,000 |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 7,388,000 |  |  |  |  |  |
Percentage of redemption price, change in ownership controllatest for redemption at face amount | 101.00% |  |  |  |  |  |  |
Percentage of redemption price, redemption date, latest for redemption at face amounttion Price, Redemption Date, Latest For Redemption At Face Amount | 100.00% |  |  |  |  |  |  |
Line of Credit [Member] | Amendment, Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 211,500,000 |
Ratio of Indebtedness to Net Capital |  |  |  |  |  |  | 6.25 |
Forecast | Line of Credit [Member] | Amendment, Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  | 5.5 |  |  |  |  |

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