Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 3,650	$ 2,988	$ 712
Provision for Other Credit Losses	1,793	4,540
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,177)	(2,277)
Allowance for Doubtful Accounts Receivable, Recoveries	$ 46	$ 13