Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 3,042	$ 3,742	$ 3,678
Charged to costs and expenses	471	1,630	2,479
Charged to other accounts	0	0	0
Deductions and other	1,450	2,330	2,415
Ending balance	2,063	3,042	3,742
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	0	254	549
Charged to other accounts	0	0	0
Deductions and other	0	254	295
Ending balance	$ 0	$ 0	$ 254