Schedule II - Valuation And Qualifying Accounts And Reserves (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	$ 5,039	$ 5,342	$ 5,343
Additions charged to costs and expenses	1,191	3,562	0
Deductions and net write-offs	(1,031)	(3,865)	(1)
Balance at end of period	$ 5,199	$ 5,039	$ 5,342