Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Common stock options	Jun. 30, 2013 Common stock options	Jun. 30, 2014 Common stock options	Jun. 30, 2013 Common stock options	Jun. 30, 2014 Restricted Stock	Jun. 30, 2013 Restricted Stock	Jun. 30, 2014 Restricted Stock	Jun. 30, 2013 Restricted Stock	Jun. 30, 2014 Restricted stock units	Jun. 30, 2013 Restricted stock units	Jun. 30, 2014 Restricted stock units	Jun. 30, 2013 Restricted stock units	Dec. 31, 2013 Convertible Debt [Member]	Dec. 10, 2013 Convertible Debt [Member]
Earnings Per Share, Basic and Diluted [Abstract]
Net Income (Loss) Attributable to Parent	$ (8,993)	$ 5,670	$ (3,698)	$ (3,665)
Shares used in computing basic net income (loss) per share	62,699	62,330	62,403	62,260
Shares used in computing diluted net income (loss) per share	62,699	65,496	62,403	62
Basic net income (loss) per share (usd per share)	$ (0.14)	$ 0.09	$ (0.06)	$ (0.06)
Diluted net income (loss) per share (usd per share)	$ (0.14)	$ 0.09	$ (0.06)	$ (58.87)
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Employee Stock Options	0	2,580	0	0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Restricted Stock	0	393	0	0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Restricted Stock Units (RSUs)	0	193	0	0
Incremental Common Shares Attributable to Share-based Payment Arrangements	0	3,166	0	0
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,376	392	2,541	3,313			1,813	387	1,917	2,727	420	0	422	397	143	5	202	189
Convertible notes	$ 68,723		$ 68,723		$ 67,101															$ 86,300
Stated interest rate																			2.25%
Potential Dilutive Effect of Securities [Abstract]
Conversion of the Notes	3,588	0			3,588	0