Taxes (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 31,789,000	$ 31,150,000	$ 8,798,000	$ 4,418,000
Stock options and other equity based compensation, tax expense (benefit)		1,500,000	300,000	(400,000)
Operating loss carryforwards		1,800,000,000				145,100,000
Tax credit carryforward		127,000,000
Increase (decrease) in valuation allowance		8,700,000	31,800,000	2,100,000
Interest and penalties accrued related to unrecognized tax benefits		1,300,000	1,000,000
Interest and penalties recognized		300,000	200,000	200,000
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0
Payments for (Proceeds from) Previous Acquisition			$ 0	$ 829,000