Condensed Consolidating Guarantor Financial Statements - Cash Flow Statements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 136,415	$ 92,417
Cash flows from investing activities:
Capital expenditures	(303,391)	(346,204)
Proceeds from sale of long-lived assets	246	16,638
Proceeds from business divestitures	146,735	0
Contributions to equity method investments	(7,466)	(18,808)
Payments to Acquire Businesses, Net of Cash Acquired	0	(293,039)
Distributions in excess of equity in earnings of affiliates	15,730	19,296
Net cash used in investing activities	(148,146)	(622,117)
Cash flows from financing activities:
Debt issuance costs	(4,720)	(10,839)
Proceeds from Issuance of Long-term Debt	1,139,500	1,353,377
Principal payments on credit facilities and other obligations	(1,376,649)	(711,941)
Debt extinguishment costs	0	(16,293)
Proceeds from preferred stock issuance, net of offering costs	342,299	0
Payments for Repurchase of Common Stock	(699)	(1,361)
Dividends paid	(111,445)	(94,714)
Proceeds from issuance of common stock under employee stock purchase plan	228	796
Intercompany borrowings (advances), net	0	0
Net cash provided by (used in) financing activities	(11,486)	519,025
Effect of exchange rate changes on cash and cash equivalents	(494)	4,472
Change in cash and cash equivalents	23,711	6,203
Cash and cash equivalents at beginning of period	93,699	74,216
Cash and cash equivalents at end of period	69,988	68,013
Reportable Legal Entities [Member] | Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	(78,542)	(43,276)
Cash flows from investing activities:
Capital expenditures	(1,139)	(4,181)
Proceeds from sale of long-lived assets	0	0
Proceeds from business divestitures	155,447
Contributions to equity method investments	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Distributions in excess of equity in earnings of affiliates	0	0
Net cash used in investing activities	154,308	(4,181)
Cash flows from financing activities:
Debt issuance costs	(475)	(10,839)
Proceeds from Issuance of Long-term Debt	541,000	1,333,377
Principal payments on credit facilities and other obligations	(217,120)	(710,547)
Debt extinguishment costs		(16,293)
Proceeds from preferred stock issuance, net of offering costs	342,299
Payments for Repurchase of Common Stock	(699)	(1,361)
Dividends paid	(111,445)	(94,714)
Proceeds from issuance of common stock under employee stock purchase plan	228	796
Intercompany borrowings (advances), net	(640,614)	(447,367)
Net cash provided by (used in) financing activities	(86,826)	53,052
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	11,060	(5,595)
Cash and cash equivalents at beginning of period	32,457	19,002
Cash and cash equivalents at end of period	21,397	24,597
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	76,038	81,718
Cash flows from investing activities:
Capital expenditures	(59,609)	(91,890)
Proceeds from sale of long-lived assets	1,892	15,530
Proceeds from business divestitures	6,753
Contributions to equity method investments	(7,466)	(2,552)
Payments to Acquire Businesses, Net of Cash Acquired		563,783
Distributions in excess of equity in earnings of affiliates	15,730	14,348
Net cash used in investing activities	(42,700)	499,219
Cash flows from financing activities:
Debt issuance costs	0	0
Proceeds from Issuance of Long-term Debt	0	0
Principal payments on credit facilities and other obligations	(565,904)	(19)
Debt extinguishment costs		0
Proceeds from preferred stock issuance, net of offering costs	0
Payments for Repurchase of Common Stock	0	0
Dividends paid	0	0
Proceeds from issuance of common stock under employee stock purchase plan	0	0
Intercompany borrowings (advances), net	532,580	(580,918)
Net cash provided by (used in) financing activities	(33,324)	(580,937)
Effect of exchange rate changes on cash and cash equivalents	(14)	0
Change in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	138,919	53,975
Cash flows from investing activities:
Capital expenditures	(242,643)	(250,133)
Proceeds from sale of long-lived assets	(1,646)	1,108
Proceeds from business divestitures	(15,465)
Contributions to equity method investments	0	(16,256)
Payments to Acquire Businesses, Net of Cash Acquired		(856,822)
Distributions in excess of equity in earnings of affiliates	0	4,948
Net cash used in investing activities	(259,754)	(1,117,155)
Cash flows from financing activities:
Debt issuance costs	(4,245)	0
Proceeds from Issuance of Long-term Debt	598,500	20,000
Principal payments on credit facilities and other obligations	(593,625)	(1,375)
Debt extinguishment costs		0
Proceeds from preferred stock issuance, net of offering costs	0
Payments for Repurchase of Common Stock	0	0
Dividends paid	0	0
Proceeds from issuance of common stock under employee stock purchase plan	0	0
Intercompany borrowings (advances), net	102,108	1,027,698
Net cash provided by (used in) financing activities	102,738	1,046,323
Effect of exchange rate changes on cash and cash equivalents	(480)	4,472
Change in cash and cash equivalents	18,577	12,385
Cash and cash equivalents at beginning of period	69,872	59,796
Cash and cash equivalents at end of period	51,295	47,411
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Capital expenditures	0	0
Proceeds from sale of long-lived assets	0	0
Proceeds from business divestitures	0
Contributions to equity method investments	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Distributions in excess of equity in earnings of affiliates	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt issuance costs	0	0
Proceeds from Issuance of Long-term Debt	0	0
Principal payments on credit facilities and other obligations	0	0
Debt extinguishment costs		0
Proceeds from preferred stock issuance, net of offering costs	0
Payments for Repurchase of Common Stock	0	0
Dividends paid	0	0
Proceeds from issuance of common stock under employee stock purchase plan	0	0
Intercompany borrowings (advances), net	5,926	587
Net cash provided by (used in) financing activities	5,926	587
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	(5,926)	(587)
Cash and cash equivalents at beginning of period	(8,630)	(4,582)
Cash and cash equivalents at end of period	$ (2,704)	$ (3,995)