Goodwill and Intangible Assets, net - Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Goodwill [Roll Forward]
Balance at December 31, 2019		$ 205,606,000	$ 205,606,000
Changes in goodwill:
Additions			0
Adjustments			31,800,000
Impairments	$ 0	(170,600,000)
Balance at June 30, 2020	66,834,000		66,834,000
Remington
Changes in goodwill:
Impairments		(121,000,000.0)
Balance at June 30, 2020	54,600,000		54,600,000
Premier
Changes in goodwill:
Impairments		(49,500,000)
Balance at June 30, 2020	0		0
Operating Segments
Changes in goodwill:
Additions			0
Operating Segments | Remington
Goodwill [Roll Forward]
Balance at December 31, 2019		143,854,000	143,854,000
Changes in goodwill:
Adjustments			31,800,000
Impairments			(121,048,000)
Balance at June 30, 2020	54,606,000		54,606,000
Operating Segments | Premier
Goodwill [Roll Forward]
Balance at December 31, 2019		49,524,000	49,524,000
Changes in goodwill:
Additions			0
Adjustments			0
Impairments			(49,524,000)
Balance at June 30, 2020	0		0
Operating Segments | JSAV
Goodwill [Roll Forward]
Balance at December 31, 2019		10,211,000	10,211,000
Changes in goodwill:
Additions			0
Adjustments			0
Impairments			0
Balance at June 30, 2020	10,211,000		10,211,000
Corporate and Other
Goodwill [Roll Forward]
Balance at December 31, 2019		$ 2,017,000	2,017,000
Changes in goodwill:
Additions			0
Adjustments			0
Impairments			0
Balance at June 30, 2020	$ 2,017,000		$ 2,017,000