Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 01, 2015	May 01, 2015	Jun. 30, 2014
Income Tax Contingency [Line Items]
Increase (decrease) in unrecognized tax benefits									$ 3,000
Federal NOL carryforward limiit due to IRC 382	$ 4,800								4,800
Current income tax expense (benefit)									17,837	$ (3,797)	$ 4,915
Income tax expense, continuing									(14,266)	9,689	65,577
Reduction of tax benefit for federal and state tax expense											$ 10,600
Effective tax rate prior to valuation allowance											37.10%
State net operating loss carryforwards	133,800								133,800
Share based compensation related tax expense									1,700
Stock-based compensation	3,210				$ 2,759				3,210	2,759
Unrealized NOLs from stock based compensation	0				400				0	400	$ 0
Windfall tax benefits	400				0				400	0	1,000
Income taxes receivable	2,437				11,390				2,437	11,390
Income taxes paid									8,800	4,600
Income tax refunds received									600	300
Valuation allowance	125				126				125	126	0	$ 75,248			$ 0
Net deferred tax (liability) asset	550								550						76,100
Reduction of tax indemnification asset									$ 4,070	$ 784	$ 1,413
Income tax expense at statutory rate									35.00%	35.00%	35.00%
Net deferred tax (liability) asset					3,021					$ 3,021
Effective tax rate									31.60%	66.70%	(230.50%)
DTA federal NOL															30,500
DTA pre-tax federal NOL carryforward															87,100
DTA intangible assets															24,800
DTA state NOLs															1,800
DTA deductible timing differences															$ 19,000
Income from continuing operations before income taxes									$ 45,146	$ (14,520)	$ 28,455	$ 27,900
Net sales	747,574	$ 821,204	$ 797,547	$ 727,418	510,162	$ 416,471	$ 357,287	$ 292,826	3,093,743	1,576,746	$ 1,311,498
Change in net sales											8.40%
Change in pretax income											2.20%
Income taxes receivable [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions					3,000					3,000
IRC 382 [Member]
Income Tax Contingency [Line Items]
Total income tax expense (benefit)									$ (1,700)	8,100
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Income tax examination period									3 years
Federal [Member]
Income Tax Contingency [Line Items]
Income tax examination period									3 years
Tax Year 2028 [Member]
Income Tax Contingency [Line Items]
NOL expiration	39,300								$ 39,300
Tax Year 2029 [Member]
Income Tax Contingency [Line Items]
NOL expiration	17,300								17,300
Tax Years 2030 through 2034 [Member]
Income Tax Contingency [Line Items]
NOL expiration	$ 31,200								$ 31,200
Tax Year 2008 [Member]
Income Tax Contingency [Line Items]
Period under examination									Jul. 31, 2008
Tax Year 2008 [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Open tax year end									Jul. 31, 2008
Tax Year 2009 [Member]
Income Tax Contingency [Line Items]
Period under examination									May 05, 2009
Tax Year 2009 [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Open tax year end									May 05, 2009
SBS [Member]
Income Tax Contingency [Line Items]
Income from continuing operations before income taxes										18,600
Net sales										103,600
Net deferred tax liability recorded													$ 75,006
Tax receivable (payable) recorded													$ 3,200
VNS [Member]
Income Tax Contingency [Line Items]
Income from continuing operations before income taxes										4,700
Net sales										$ 103,100
Net deferred tax liability recorded														$ 4,364
Tax receivable (payable) recorded														$ (400)
State Net Operating Loss Carryforwards [Member] | Income Tax Expense [Member]
Income Tax Contingency [Line Items]
Out-of-period expense					$ 900
Discrete Item [Member]
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance from continuing operations											$ 76,100