Schedule II - Consolidated Valuation and Qualifying Accounts (Details 2) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts:
Balance, beginning of period		$ 9,511	$ 10,085	$ 10,818
Charged to Costs and Expenses		11,343	8,548	5,725
Other	[1]	1,012	1,335	1,395
Deductions	[2]	12,031	10,457	7,853
Balance, end of period		$ 9,835	$ 9,511	$ 10,085

[1] Recoveries.

[2] Uncollectible accounts written off.