Segments (Reconciliation of adjusted EBITDA to consolidated financial statements) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 01, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Income (loss) before income taxes		$ 45,146	$ (14,520)	$ 28,455	$ 27,900
Interest expense		30,131	27,552	27,090
Depreciation and amortization		68,680	24,589	15,457
Impairment of assets		11,928	0	134
Merger and integration costs		15,340	22,993	0
Inventory step-up charges		2,884	10,285	0
Non-cash stock compensation expense		7,252	2,749	3,410
Loss on debt extinguishment		12,529	0	0
Headquarters relocation		0	3,865	2,054
Insurance reserve adjustments and casualty fire loss		0	3,026	669
Loss portfolio transfer		0	2,826	0
Acquisition costs and other items		0	2,677	0
Other reconciling items [Member] | Other reconciling items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		2,088	863	551
Adjusted EBITDA		50,726	36,872	21,664
Operating segments [Member] | Geographic divisions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		66,592	23,726	14,906
Adjusted EBITDA		(244,616)	(122,914)	$ (98,933)
SBS [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Income (loss) before income taxes			18,600
Inventory step-up charges	$ 13,200	$ 2,900	$ 10,300