Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Allowance for Doubtful Accounts and Other Accounts Receivable Allowance

The following is an analysis of the allowance for doubtful accounts and other accounts receivable allowances for the years ended December 31, 2015, 2014 and 2013:  

(In thousands)	2015			2014			2013
Balance at January 1	$	10,011		$	5,945		$	5,533
Provision charged to income		1,106			4,625			719
Accounts written off, net of recoveries		(3,071	)		(559	)		(307	)
Balance at December 31	$	8,046		$	10,011		$	5,945