Inventories (Balance Sheet Adjustments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventory
Inventory - net	$ 124,504	$ 102,730
Other accrued liabilities	13,624	9,764
Deferred tax liabilities	5,287	6,914
Retained earnings	114,324	145,797
Previously Reported
Inventory
Inventory - net		97,543
Other accrued liabilities		9,764
Deferred tax liabilities		9,744
Retained earnings		137,780
Adjustments
Inventory
Inventory - net		5,187
Other accrued liabilities		0
Deferred tax liabilities		(2,830)
Retained earnings		$ 8,017
Effects of change
Inventory
Inventory - net	11,821
Other accrued liabilities	1,090
Deferred tax liabilities	0
Retained earnings	10,731
Pro forma
Inventory
Inventory - net	112,683
Other accrued liabilities	12,534
Deferred tax liabilities	5,287
Retained earnings	$ 103,593