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Quarterly Financial Data (Unaudited) - Consolidated 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 income (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)
Other comprehensive income (loss), net of tax:                                
Change in the funded status status of retiree benefit obligations   0 0 0 26,700   0 0 0 0 0   10,969 (26,574) 36,731 (5,938)
Income tax expense   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 income (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)
Other comprehensive income (loss), net of tax:                                
Change in the funded status status of retiree benefit obligations   0 0 0 33,341   0 0 0 0 0     (33,341) 25,634 (4,787)
Income tax expense   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 income (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]
Other comprehensive income (loss), net of tax:                                
Change in the funded status status of retiree benefit obligations   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]
Income tax expense   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.