Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period	$ 5,564	$ 6,310	$ 7,282
Charged to Costs and Expenses	1,511	1,741	1,074
Deductions	2,622	2,487	2,046
Balance at End of Period	$ 4,453	$ 5,564	$ 6,310