Commitments And Contingencies Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Rent Expense, Net	$ 7.7	$ 3.2	$ 2.9
Line of Credit Facility, Maximum Borrowing Capacity	40.0
Debt instrument, security interest of stock issued percentage	65.00%
Letter Of Credit Sublimit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10.0
Base Interest Rate [Member]
London Inter Bank Offered Rate Margin	1.50%
Federal Funds Rate Margin	0.50%
Minimum [Member]
London Inter Bank Offered Rate Margin	1.50%
Minimum [Member] | Base Interest Rate [Member]
London Inter Bank Offered Rate Margin	0.50%
Maximum [Member]
London Inter Bank Offered Rate Margin	2.00%
Maximum [Member] | Base Interest Rate [Member]
London Inter Bank Offered Rate Margin	1.00%