UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Operating revenues	$ 153,258	$ 130,309	$ 307,138	$ 222,880
Operating expenses:
Cost of goods and services, exclusive of depreciation and amortization shown separately below	53,381	50,296	107,142	82,057
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	43,022	33,694	83,175	55,120
Integration and acquisition expenses	3,678	20,054	8,167	20,386
Depreciation and amortization	44,925	32,415	89,729	50,154
Total operating expenses	145,006	136,459	288,213	207,717
Operating income (loss)	8,252	(6,150)	18,925	15,163
Other income (expense):
Interest expense	(9,389)	(5,904)	(18,489)	(7,524)
Gain on investments, net	73	21	193	109
Non-operating income, net	1,224	146	2,479	614
Income (loss) before income taxes	160	(11,887)	3,108	8,362
Income tax expense (benefit)	240	(4,892)	847	1,477
Net income (loss)	(80)	(6,995)	2,261	6,885
Other comprehensive income (loss):
Unrealized loss on interest rate hedge, net of tax	(1,375)	(3,238)	(776)	(4,285)
Comprehensive income (loss)	$ (1,455)	$ (10,233)	$ 1,485	$ 2,600
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.00	$ (0.14)	$ 0.05	$ 0.14
Diluted (in dollars per share)	$ 0.00	$ (0.14)	$ 0.05	$ 0.14
Weighted average shares outstanding, basic (in shares)	49,115	48,830	49,083	48,696
Weighted average shares outstanding, diluted (in shares)	49,115	48,830	49,850	49,415