Allowance for Customer Deductions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 23,838	$ 14,023	$ 6,333
Provision	201,387	124,081	75,345
Additions from business combinations			2,214
Charges processed	(202,058)	(114,266)	(69,869)
Balance at end of year	23,167	23,838	14,023
Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	8,409	6,846	3,463
Provision	5,001	3,783	2,687
Additions from business combinations			1,845
Charges processed	(5,246)	(2,220)	(1,149)
Balance at end of year	8,164	8,409	6,846
Chargebacks & Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	13,452	5,949	2,522
Provision	183,403	112,243	68,067
Additions from business combinations			0
Charges processed	(183,973)	(104,740)	(64,640)
Balance at end of year	12,882	13,452	5,949
Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	1,362	743	345
Provision	8,464	6,074	3,431
Additions from business combinations			50
Charges processed	(8,182)	(5,455)	(3,083)
Balance at end of year	1,644	1,362	743
Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	30	99	3
Provision	(5)	(82)	25
Additions from business combinations			187
Charges processed	0	13	(116)
Balance at end of year	25	30	99
Advert. & Promotions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	585	386	0
Provision	4,524	2,063	1,135
Additions from business combinations			132
Charges processed	(4,657)	(1,864)	(881)
Balance at end of year	$ 452	$ 585	$ 386