CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 96,433	$ 71,002
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	12,241	12,514
Amortization of intangibles	14,961	15,945
Net loss/(gain) on the sale of assets	40	(8,315)
Deferred income taxes	(935)	(4,772)
Excess tax benefits from stock-based compensation	(509)	0
Loss on debt extinguishment	487	5,620
Stock-based compensation	8,618	6,655
Impairment of goodwill	1,663	0
Non-cash interest expense	2,718	3,366
Changes in operating assets and liabilities
Accounts receivable	(5,117)	(3,744)
Inventories	(29,587)	(50,366)
Prepaid expenses and other	(11,021)	(2,704)
Accounts payable and accrued liabilities	15,478	58,465
Other, net	496	1,025
Net cash provided by operating activities	105,966	104,691
Cash flows from investing activities
Capital expenditures	(15,045)	(12,554)
Proceeds from the sale of property, plant and equipment	14	13,180
Other, net	2,268	(5,358)
Net cash (used in) investing activities	(12,763)	(4,732)
Cash flows from financing activities
Proceeds from exercise of stock options	2,341	1,959
Excess tax benefits from stock-based compensation	509	0
Borrowings under revolving credit facilities	455	665
Payments under revolving credit facilities	(455)	(613)
Principal payments under capital lease obligations	(633)	(3,964)
Proceeds from issuance of term loan credit facility	0	192,845
Principal payments under term loan credit facility	(1,446)	(193,809)
Principal payments under industrial revenue bond	(386)	(370)
Debt issuance costs paid	0	(2,581)
Stock repurchase	(40,739)	(43,017)
Convertible senior notes repurchase	(42,061)	0
Net cash (used in) financing activities	(82,415)	(48,885)
Net increase in cash and cash equivalents	10,788	51,074
Cash and cash equivalents at beginning of period	178,853	146,113
Cash and cash equivalents at end of period	$ 189,641	$ 197,187