Quarterly Financial Data (Unaudited) - Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 128,763	$ 126,343	$ 135,705	$ 119,153	$ 120,948	$ 121,527	$ 131,770	$ 121,197	$ 254,858	$ 252,967	$ 381,201	$ 374,494	$ 509,964	$ 495,442	$ 463,945	$ 450,318
Gross profit	47,490	48,675	50,353	44,621	45,529	43,147	44,541	39,685	94,974	84,226	143,649	127,373	191,139	172,902	157,487	195,632
Loss from operations	(2,729)	(494)	547	(1,419)	(8,615)	(3,812)	(5,353)	(4,334)	(872)	(9,687)	(1,366)	(13,499)	(4,095)	(22,114)	(70,367)	(40,599)
Net loss	$ (2,978)	$ (1,306)	$ (7,157)	$ 2,979	$ (10,272)	$ (5,211)	$ (3,813)	$ (7,280)	$ (4,178)	$ (11,093)	$ (5,484)	$ (16,304)	$ (8,462)	$ (26,576)	$ (52,033)	$ (25,359)
Net loss per common share - basic and diluted, in dollars per share	$ (0.19)	$ (0.08)	$ (0.46)	$ 0.19	$ (0.65)	$ (0.33)	$ (0.25)	$ (0.48)	$ (0.27)	$ (0.73)	$ (0.35)	$ (1.06)	$ (0.54)	$ (1.72)	$ (3.45)	$ (1.71)