Employee Benefit Plans Defined Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				1 Months Ended	11 Months Ended	1 Months Ended	11 Months Ended
	Dec. 31, 2013 Successor company Qualified Pension	Dec. 31, 2012 Successor company Qualified Pension	Dec. 31, 2013 Successor company Post-retirement Healthcare	Dec. 31, 2012 Successor company Post-retirement Healthcare	Jan. 24, 2011 Predecessor company Qualified Pension	Dec. 31, 2011 Predecessor company Qualified Pension	Jan. 24, 2011 Predecessor company Post-retirement Healthcare	Dec. 31, 2011 Predecessor company Post-retirement Healthcare
Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 166,304	$ 160,293	$ 0	$ 961
Actual return on plan assets	18,883	13,931
Plan settlements	(7,931)	(3,517)
Employer contributions	21,800	19,842	3,704	2,530
Benefits paid	(23,814)	(24,245)	(3,704)	(3,491)
Ending Balance	175,242	166,304	0	0
Projected Benefit Obligation [Roll Forward]
Beginning projected benefit obligation	369,841	318,254	621,443	533,181
Service cost	18,543	15,489	26,712	25,423	849	11,885	1,167	18,944
Interest cost	14,934	14,565	24,555	23,958	934	12,882	1,252	19,859
Plan settlements	(7,931)	(3,517)
Benefits paid	(23,814)	(24,245)	(3,704)	(3,491)
Actuarial loss (gain)	(42,797)	49,295	(78,571)	42,372
Ending projected benefit obligation	328,776	369,841	590,435	621,443
Plan assets less than projected benefit obligation	(153,534)	(203,537)	(590,435)	(621,443)
Accumulated Benefit Obligation	290,910	323,432
Amounts Recognized in the Consolidated Balance Sheets [Abstract]
Current liabilities			(5,701)	(5,064)
Non-current liabilities	(153,534)	(203,537)	(584,734)	(616,379)
Net amount recognized	(153,534)	(203,537)	(590,435)	(621,443)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	(60,349)	(116,835)	(111,960)	(197,929)
Net amount recognized in accumulated other comprehensive loss	60,349	116,835	111,960	197,929
Defined Benefit Plan, Settlements, Benefit Obligation	$ (7,931)	$ (3,517)