Commitments, Contingencies and Guarantees - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1,900,000	$ 900,000	$ 3,200,000	$ 1,600,000
Warranty liability	4,512,000		4,512,000		3,691,000
Warranty liability recorded as element of long-term liabilities	$ 200,000		$ 200,000		$ 200,000