Schedule II -- Valuation and Qualifying Accounts (Consolidated) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts & Discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 5,586	$ 5,846	$ 5,703
Charged to expense or other accounts		2,719	1,040	198
Deductions	[1]	(1,239)	(1,300)	(55)
Balance at end of period		7,066	5,586	5,846
Valuation Allowance for Deferred Tax Asset
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		66,486	46,048	77,629
Charged to expense or other accounts		6,093	21,420	2,235
Deductions	[2]	(61,395)	(982)	(33,816)
Balance at end of period		$ 11,184	$ 66,486	$ 46,048

[1] Uncollectible accounts written off, net of recoveries.

[2] The net decrease in valuation allowance is primarily a result of net changes in cumulative book/tax timing differences and, with respect to activity for the year ended December 31, 2015, changes in judgment regarding the realizability of U.S. deferred tax assets.