Goodwill And Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 63,522	$ 67,404	$ 81,021
Accumulated Amortization	28,497	27,119	25,821
Tradenames and trademarks
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount	15,054	15,054	24,353
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,037	44,037	48,657
Accumulated Amortization	25,960	23,942	22,955
Favorable lease contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	3,882	3,882
Accumulated Amortization	0	1,016	837
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,435	2,435	2,435
Accumulated Amortization	862	645	572
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,466	1,466	1,164
Accumulated Amortization	1,157	1,059	1,027
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	530	530	530
Accumulated Amortization	$ 518	$ 457	$ 430