Reorganization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring reserve	$ 29,045	$ 17,544	$ 0	$ 0
Charges	17,156	26,735	41,738	106,389
Non-cash adjustment			(24,194)
Cash payments	(8,373)	(15,234)	0
Restructuring reserve	37,828	29,045	17,544	37,828
Amount expected to be incurred	121,275			121,275
Severance and retention
Restructuring Reserve [Roll Forward]
Restructuring reserve	24,634	14,435	0	0
Charges	16,344	20,927	14,435
Non-cash adjustment			0
Cash payments	(4,413)	(10,728)	0
Restructuring reserve	36,565	24,634	14,435	36,565
Amount expected to be incurred	82,038			82,038
Long-lived asset impairments and contract and lease terminations
Restructuring Reserve [Roll Forward]
Restructuring reserve	905	1,060	0	0
Charges	17	13	22,307
Non-cash adjustment			(21,247)
Cash payments	(152)	(168)	0
Restructuring reserve	770	905	1,060	770
Amount expected to be incurred	27,651			27,651
Other transaction costs
Restructuring Reserve [Roll Forward]
Restructuring reserve	3,506	2,049	0	0
Charges	795	5,795	4,996
Non-cash adjustment			(2,947)
Cash payments	(3,808)	(4,338)	0
Restructuring reserve	493	3,506	$ 2,049	493
Amount expected to be incurred	11,586			11,586
Premium deficiency reserves
Restructuring Reserve [Roll Forward]
Restructuring reserve	169,101
Charges	91,054
Restructuring reserve	78,047	$ 169,101		78,047
Amount expected to be incurred	$ 290,376			$ 290,376