ACCOUNTS RECEIVABLE, NET - Allowance for Disallowed Revenue And Allowance for Doubtful Accounts(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Disallowed Revenue
Balance at the beginning	$ 52,277	$ 31,447	$ 31,136
Additions	119,323	94,965	73,118
Reductions	(84,408)	(74,135)	(72,807)
Balance at the end	87,192	52,277	31,447
Allowance for Doubtful Accounts
Balance at the beginning	6,472	4,928	3,844
Additions	14,241	8,125	4,163
Reductions	(10,769)	(6,581)	(3,079)
Balance at the end	9,944	6,472	4,928
Dosteon | Loss on discontinued operations net of income tax
Allowance for Doubtful Accounts
Bad debts expense	2,600	3,100	(300)
Disallowed revenue	$ 14,000	$ 8,700	$ 5,800