Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 201,907	$ 206,816
Operating expenses:
Cost of services and sales, excluding depreciation and amortization	97,806	105,039
Other post-employment benefit and pension expense/(benefit)	3,097	(53,228)
Selling, general and administrative expense	49,853	50,336
Depreciation and amortization	54,794	57,638
Total operating expenses	205,550	159,785
Income/(loss) from operations	(3,643)	47,031
Other income/(expense):
Interest expense	(20,378)	(20,610)
Other, net	163	158
Total other expense	(20,215)	(20,452)
Income/(loss) before income taxes	(23,858)	26,579
Income tax benefit/(expense)	3	(8,011)
Net income/(loss)	$ (23,855)	$ 18,568
Weighted average shares outstanding:
Basic, in shares	26,961,440	26,811,697
Diluted, in shares	26,961,440	27,118,881
Income (loss) per share, basic (in dollars per share)	$ (0.88)	$ 0.69
Income (loss) per share, diluted (in dollars per share)	$ (0.88)	$ 0.68