UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Operating revenues	$ 153,880	$ 92,571
Operating expenses:
Cost of goods and services, exclusive of depreciation and amortization shown separately below	53,761	31,762
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	40,153	21,426
Integration and acquisition expenses	4,489	332
Depreciation and amortization	44,804	17,739
Total operating expenses	143,207	71,259
Operating income	10,673	21,312
Other income (expense):
Interest expense	(9,100)	(1,619)
Gain on investments, net	120	88
Non-operating income, net	1,255	468
Income before income taxes	2,948	20,249
Income tax expense	607	6,368
Net income	2,341	13,881
Other comprehensive income (loss):
Unrealized gain (loss) on interest rate hedge, net of tax	599	(1,048)
Comprehensive income	$ 2,940	$ 12,833
Earnings per share:
Basic (in dollars per share)	$ 0.05	$ 0.29
Diluted (in dollars per share)	$ 0.05	$ 0.28
Weighted average shares outstanding, basic (in shares)	49,050	48,563
Weighted average shares outstanding, diluted (in shares)	49,834	49,249