Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 6,212	$ 10,826	$ 13,045
Charged to Costs & Expenses		8,508	1,736	3,228
Charged to Other Accounts		0	0	0
Deductions	[1]	(5,863)	(6,350)	(5,447)
Balance at End of Period		8,857	6,212	10,826
Claim Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		25,344	24,871	26,128
Charged to Costs & Expenses		15,816	10,448	11,138
Charged to Other Accounts		0	0	0
Deductions	[2]	(14,221)	(9,975)	(12,395)
Balance at End of Period		26,939	25,344	24,871
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		19,171	21,911	24,173
Charged to Costs & Expenses		25,946	(2,645)	(5,506)
Charged to Other Accounts	[3]	(238)	(95)	3,244
Deductions		0	0	0
Balance at End of Period		$ 44,879	$ 19,171	$ 21,911

[1] Amount represents accounts written off, net of recoveries.

[2] Amount represents claim payments, net of recoveries.

[3] Amount represents adjustments for acquired net operating loss and credit carryforwards.(4)Amount includes an out-of-period adjustment identified in the fourth quarter of 2016. See further discussion in Note 9 – Income Taxes.