Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of all Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Carrying Value
Fair value measurement
Long term debt	$ 128,926	$ 131,077
Fair Value
Fair value measurement
Long term debt	148,829	132,437
Non-recurring basis | Carrying Value | Level 2 | 3.75% Convertible Notes
Fair value measurement
Long term debt	70,197	69,382
Non-recurring basis | Fair Value | Level 2 | 3.75% Convertible Notes
Fair value measurement
Long term debt	90,100	70,742
Term loan | Non-recurring basis | Carrying Value | Level 2
Fair value measurement
Long term debt	38,307	38,010
Term loan | Non-recurring basis | Fair Value | Level 2
Fair value measurement
Long term debt	38,307	38,010
Revolving Credit Facility | Non-recurring basis | Carrying Value | Level 2
Fair value measurement
Long term debt	20,422	23,685
Revolving Credit Facility | Non-recurring basis | Fair Value | Level 2
Fair value measurement
Long term debt	$ 20,422	$ 23,685