General - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 865,297			$ 785,871
Inventory reserves				11,251
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 1,000
Other Current Assets | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventory portion of the sales return reserve		$ 4,819
Wholesale | Other Accrued Expenses | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for sales returns included in other accrued expenses		$ 9,816
Sales Returns and Allowances | Wholesale
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Allowances				$ 20,848