Accounts Receivable (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Allowance for Doubtful Accounts and Sales Returns [Member]	Dec. 31, 2012 Allowance for Doubtful Accounts and Sales Returns [Member]	Dec. 31, 2011 Allowance for Doubtful Accounts and Sales Returns [Member]
Changes in allowance for doubtful accounts and sales returns [Abstract]
Balance at Beginning of Period				$ 14,074	$ 4,080	$ 1,322
Net Additions Charged to Revenue and Expenses				693	10,523	2,766
Deductions				(2,829)	(529)	(8)
Balance at End of Period				11,938	14,074	4,080
Bad debt written off		2,492
Sales returns		337
Uncollectible contracts receivable losses provision for losses	7,855		12,051
Net income loss attributable to changes in estimates of bad debts and sales returns			$ 7,855
Net loss attributable to changes in bad debts and sales returns (in dollars per share)	$ 0.15		$ 0.09