Income Taxes Income Taxes (Deferred Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Deferred tax assets related to
Accounts receivable	$ 2,951	$ 3,780
Inventory	2,857	4,725
Goodwill and intangibles	0	0
Accrued compensation	6,044	5,462
Insurance Reserves	17,126	14,186
Stock-based compensation	3,210	2,759
Restructuring reserves	1,868	4,008
Other accrued liabilities	665	918
Federal net operating loss carryforward	30,664	32,361
State net operating loss carryforward	5,593	5,036
Other	2,398	283
Deferred tax assets, gross	73,376	73,518
Valuation allowance	(125)	(126)	$ 0	$ 0	$ (75,248)
Total deferred tax assets	73,251	73,392
Deferred tax liabilities related to
Goodwill and intangibles	(31,808)	(32,452)
Property and equipment	(38,836)	(42,261)
Other assets	(2,057)	(1,700)
Total deferred tax liabilities	72,701	76,413
Net deferred tax (liability) asset	$ 550			$ 76,100
Net deferred tax (liability) asset		$ (3,021)