Accounts Receivable (Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Trade receivables	$ 137,389	$ 118,531
Allowance for doubtful accounts	(2,290)	(2,101)
Allowance for sales returns and discounts	(2,195)	(1,982)
Accounts receivable, net	$ 132,904	$ 114,448