Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 1,807	$ 2,474
Accumulated amortization	$ 44,474	$ 28,575
Common Stock, par value
Common Stock, shares authorized	55,000,000	55,000,000
Common Stock, shares issued	34,929,334	29,818,225
Common Stock, shares outstanding	34,929,334	29,818,225