Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net (loss) income	$ (2,685)	$ 1,007
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion	10,569	8,970
Change in fair value of contingent consideration	705	979
Recovery of doubtful accounts, net	(169)	(314)
Deferred tax provision	(2,736)	(167)
Stock compensation	2,865	2,404
Other	111	56
Changes in operating assets and liabilities:
Trade accounts receivable	77,983	80,751
Inventories	49,272	43,076
Prepaid expenses and other current assets	68,837	(7,413)
Income tax receivable	0	(4,799)
Other assets	(758)	44
Trade accounts payable	(74,898)	(72,295)
Contingent consideration	(2,974)	(6,458)
Accrued expenses	(33,666)	(9,169)
Income taxes payable	(46,545)	(21,735)
Long-term liabilities	1,998	830
Net cash provided by operating activities	47,909	15,767
Cash flows from investing activities:
Purchases of property and equipment	(17,603)	(12,104)
Purchases of intangible assets	(30)	0
Net cash used in investing activities	(17,633)	(12,104)
Cash flows from financing activities:
Cash paid for shares withheld for taxes	(3,752)	(1,804)
Excess tax benefits from stock compensation	0	270
Contingent consideration and deferred payments paid	(15,852)	(22,628)
Proceeds from issuance of short-term borrowing	0	10,000
Cash paid for repayment of short-term borrowings	(3,000)	(33,000)
Net cash used in financing activities	(22,604)	(47,162)
Effect of exchange rates on cash	291	(2,157)
Net change in cash and cash equivalents	7,963	(45,656)
Cash and cash equivalents at beginning of period	237,125	110,247
Cash and cash equivalents at end of period	245,088	64,591
Cash paid during the period for:
Income taxes	48,040	27,885
Interest	187	68
Non-cash investing activity:
Accruals for purchases of property and equipment	4,265	1,263
Accruals for asset retirement obligations	19	23
Non-cash financing activity:
Accruals for shares withheld for taxes	$ 0	$ 1,365