Summary of Significant Accounting Policies (Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable, Net [Abstract]
Balance at beginning of year	$ 2,906	$ 3,015	$ 2,885
Additions:
Charged to costs and expense	2,098	3,087	6,209
Recovery of previous write-offs	1,929	2,041	2,034
Uncollectible receivables written off	4,672	5,237	8,113
Balance at end of year	$ 2,261	$ 2,906	$ 3,015