Restatement Statements of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended															6 Months Ended				9 Months Ended				12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Dec. 31, 2012		Dec. 31, 2011		Mar. 31, 2013		Mar. 31, 2012		Jun. 30, 2013	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2010
Net loss	$ (2,978)	$ (1,306)		$ (7,157)		$ 2,979		$ (10,272)		$ (5,211)		$ (3,813)		$ (7,280)		$ (4,178)		$ (11,093)		$ (5,484)		$ (16,304)		$ (8,462)	$ (26,576)		$ (52,033)		$ (25,359)
Retiree benefits		0		0		0		26,700				0		0		0		0		0				10,969	(26,574)		36,731		(5,938)
Tax benefit on retiree benefits		0		0		0		0		0		0		0		0		0		0		0		(1,066)	0		(14,053)		0
Total comprehensive income (loss), net of tax		(1,306)		(7,157)		2,979		(36,972)		(5,211)		(3,813)		(7,280)		(4,178)		(11,093)		(5,484)		(16,304)		(6,480)	(53,150)		(29,355)		(31,297)
Previously Reported
Net loss		(1,415)		(7,294)		2,874		(12,134)		(5,501)		(4,110)		(7,584)		(4,420)		(11,694)		(5,835)		(17,195)			(29,329)		(54,317)		(23,953)
Retiree benefits		0		0		0		33,341				0		0		0		0		0					(33,341)		25,634		(4,787)
Tax benefit on retiree benefits		0		0		0		0		0		0		0		0		0		0		0			0		(9,823)		0
Total comprehensive income (loss), net of tax		(1,415)		(7,294)		2,874		(45,475)		(5,501)		(4,110)		(7,584)		(4,420)		(11,694)		(5,835)		(17,195)			(62,670)		(38,506)		(28,740)
Adjustments
Net loss		109	[1]	137	[1]	105	[1],[2]	1,862	[1]	290	[1]	297	[1]	304	[1],[2]	242	[1],[2]	601	[1],[2]	351	[1],[2]	891	[1],[2]		2,753	[3],[4]	2,284	[3],[5],[6]	(1,406)	[3],[5],[7]
Retiree benefits		0	[1]	0	[1]	0	[1]	(6,641)	[1]			0	[1]	0	[1]	0	[1]	0	[1]	0	[1]				6,767	[3]	11,097	[5]	(1,151)	[5]
Tax benefit on retiree benefits		0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]		0	[3]	(4,230)	[5]	0	[5]
Total comprehensive income (loss), net of tax		$ 109	[1]	$ 137	[1]	$ 105	[1]	$ 8,503	[1]	$ 290	[1]	$ 297	[1]	$ 304	[1]	$ 242	[1]	$ 601	[1]	$ 351	[1]	$ 891	[1]		$ 9,520	[3]	$ 9,151	[3],[5]	$ (2,557)	[3],[5]

[1] See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included in Note 2.

[2] For details see the introduction section included in Note 2.

[3] (1) See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included elsewhere in this Note 2.

[4] See the introduction section included elsewhere in this Note 2.

[5] See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included elsewhere in this Note 2.

[6] (1)See the introduction section included elsewhere in this Note 2.

[7] _______________ (1)See the introduction section included elsewhere in this Note 2.