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Debt (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 37 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2024 | May 03, 2016 | Mar. 23, 2016 | Oct. 23, 2014 | Mar. 20, 2013 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | May 01, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to deferred acquisition consideration included in interest expense |  |  |  |  |  | $ 14,000 | $ 25,000 | $ 26,000 | $ 54,000 |  |  |  |
Amount outstanding under the line of credit |  |  |  |  |  | 115,244,000 |  | 115,244,000 |  |  |  |  | $ 0
Amount of letters of credit outstanding |  |  |  |  |  | $ 5,248,000 |  | $ 5,248,000 |  |  |  |  |
6.50% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  | 6.50% |
6.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 6.75% |  |  |  |  |  |  |  |
Loss on redemption of notes |  |  |  |  |  |  |  |  |  | $ 33,298 |  |  |
Wells Fargo Capital Finance, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  | May 03, 2021 |  | Sep. 30, 2019 |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  | $ 225,000,000 |  |  |  |  |  |  |  |
Expiration date of credit facility |  |  |  |  | Dec. 31, 2018 |  |  |  |  |  |  |  |
Increase in line of credit facility |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |
Wells Fargo Capital Finance, LLC | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 1.75% |  | 1.00% |  |  |  |  |  |  |  |  |
Wells Fargo Capital Finance, LLC | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
Wells Fargo Capital Finance, LLC | Non-Prime Rate and Prime Rate on European Advances |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.50% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 6.50% |  |  | 6.50% |  | 6.50% |  |  |  |  |
Debt instrument, maturity date |  |  | May 01, 2024 |  |  |  |  |  |  |  |  |  |
Proceeds from offering |  |  | $ 880,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption date, one |  |  |  |  |  |  |  | May 01, 2019 |  |  |  |  |
Percentage of redemption price, redemption date one (percent) |  |  |  |  |  |  |  | 104.875% |  |  |  |  |
Percentage of redemption price, redemption date two (percent) |  |  |  |  |  |  |  | 103.25% |  |  |  |  |
Debt instrument, redemption date, two |  |  |  |  |  |  |  | May 01, 2020 |  |  |  |  |
Percentage of redemption price, redemption date three (percent) |  |  |  |  |  |  |  | 101.625% |  |  |  |  |
Debt instrument, redemption date, three |  |  |  |  |  |  |  | May 01, 2021 |  |  |  |  |
Percentage of redemption price, redemption date, latest for redemption at face amount (percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Debt instrument, redemption date, latest for redemption at face amount |  |  |  |  |  |  |  | May 01, 2022 |  |  |  |  |
Percentage redeemable redemption date, additional (percent) |  |  |  |  |  |  |  | 106.50% |  |  |  |  |
Percentage of redemption price, change in ownership control (percent) |  |  |  |  |  |  |  | 101.00% |  |  |  |  |
Forecast | Wells Fargo Capital Finance, LLC | 6.50% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | May 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Optional Redemption | Forecast | 6.50% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price redemption date, additional (percent) |  |  |  |  |  |  |  |  |  |  | 35.00% |  |

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