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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities      
Net income $ 46,529 $ 105,631 $ 15,042
Adjustments to reconcile net income to net cash provided by (used in) operating activities      
Depreciation 16,550 14,975 12,636
Amortization of intangibles 21,786 10,590 2,955
Net loss (gain) on sale of assets 140 203 (9)
Loss on debt extinguishment 1,889 0 668
Deferred income taxes 30,089 (57,283) 0
Stock-based compensation 7,480 5,149 3,398
Accretion of debt discount 4,643 2,972 0
Changes in operating assets and liabilities      
Accounts receivable (23,691) 1,180 (14,366)
Inventories 6,260 41,696 (78,683)
Prepaid expenses and other (3,893) 736 (162)
Accounts payable and accrued liabilities 18,082 (46,786) 56,968
Other, net 2,805 (3,046) 386
Net cash provided by (used in) operating activities 128,669 76,017 (1,167)
Cash flows from investing activities      
Capital expenditures (18,352) (14,916) (7,264)
Acquisitions, net of cash acquired (15,985) (364,012) 0
Proceeds from the sale of property, plant and equipment 305 607 17
Other 2,500 (2,500) 0
Net cash used in investing activities (31,532) (380,821) (7,247)
Cash flows from financing activities      
Proceeds from exercise of stock options 600 354 538
Borrowings under revolving credit facilities 1,166 206,015 848,705
Payments under revolving credit facilities (1,166) (271,015) (838,705)
Principal payments under capital lease obligations (1,700) (1,629) (671)
Proceeds from issuance of convertible senior notes 0 145,500 0
Proceeds from issuance of term loan credit facility, net of issuance costs 0 292,500 0
Principal payments under term loan credit facility (62,827) (2,250) 0
Proceeds from issuance of industrial revenue bond 0 2,500 0
Principal payments under industrial revenue bond (381) 0 0
Debt issuance costs paid (981) (5,134) (1,989)
Stock repurchase (35) (564) (533)
Proceeds from issuance of common stock, net of expenses 0 0 (155)
Net cash (used in) provided by financing activities (65,324) 366,277 7,190
Net increase (decrease) in cash 31,813 61,473 (1,224)
Cash and cash equivalents at beginning of year 81,449 19,976 21,200
Cash and cash equivalents at end of year 113,262 81,449 19,976
Cash paid during the period for      
Interest 20,913 16,050 3,836
Income taxes $ 941 $ 594 $ 73