Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 180,202	$ 161,448
Costs, expenses and other:
Cost of sales	138,630	130,421
Depreciation, depletion and amortization	16,059	14,426
Selling and administrative	13,331	11,887
Heritage health benefit expenses	3,544	3,951
Loss (gain) on sales of assets	38	(234)
Restructuring charges	397	0
Other operating loss (income)	150	(4,737)
Total costs, expenses and other	172,149	155,714
Operating income	8,053	5,734
Other income (expense):
Interest expense	(20,798)	(10,160)
Interest income	302	297
Loss on foreign exchange	(6,790)	0
Other income	93	70
Total other income (expense)	(27,193)	(9,793)
Loss before income taxes	(19,140)	(4,059)
Income tax expense (benefit)	(110)	28
Net loss	(19,030)	(4,087)
Less net loss attributable to noncontrolling interest	0	(1,702)
Net loss attributable to the Parent company	(19,030)	(2,385)
Less preferred stock dividend requirements	261	340
Net loss applicable to common shareholders	$ (19,291)	$ (2,725)
Net loss per share applicable to common shareholders:
Basic and diluted (in dollars per share)	$ (1.30)	$ (0.19)
Weighted average number of common shares outstanding:
Basic and diluted (shares)	14,787	14,282