Condensed Consolidating Guarantor Financial Statements - Cash Flow Statements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 92,294	$ 76,137
Cash flows from investing activities:
Capital expenditures	(211,098)	(128,934)
Proceeds from sale of long-lived assets	16,163	114
Contributions to equity method investments	(9,627)	(3,448)
Proceeds from sale of common units of equity method investee	0	60,483
Distributions in excess of equity in earnings of affiliates	13,410	13,778
Net cash used in investing activities	(191,152)	(58,007)
Cash flows from financing activities:
Debt issuance costs	(6,019)	0
Proceeds from Issuance of Long-term Debt	550,018	283,500
Principal payments on credit facilities and other obligations	(388,730)	(272,881)
Proceeds from issuance of common shares, net of offering costs	0	228,546
Debt extinguishment costs	(16,293)	0
Distributions to noncontrolling interests	0	(21,485)
Payments for Repurchase of Common Stock	(1,266)	(904)
Dividends paid	(59,493)	(39,720)
Proceeds from issuance of common stock under employee stock purchase plan	542	555
Intercompany borrowings (advances), net	0	0
Net cash provided by financing activities	78,759	177,611
Effect of exchange rate changes on cash and cash equivalents	2,418	1,943
Change in cash and cash equivalents	17,681	(197,684)
Cash and cash equivalents at beginning of period	74,216	58,096
Cash and cash equivalents at end of period	56,535	255,780
Reportable Legal Entities [Member] | Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	(11,069)	26,826
Cash flows from investing activities:
Capital expenditures	(2,959)	(1,350)
Proceeds from sale of long-lived assets	0	0
Contributions to equity method investments	0	0
Proceeds from sale of common units of equity method investee		60,483
Distributions in excess of equity in earnings of affiliates	0	13,767
Net cash used in investing activities	(2,959)	72,900
Cash flows from financing activities:
Debt issuance costs	(6,019)
Proceeds from Issuance of Long-term Debt	550,018	118,000
Principal payments on credit facilities and other obligations	(388,719)	(148,367)
Proceeds from issuance of common shares, net of offering costs		228,546
Debt extinguishment costs	(16,293)
Distributions to noncontrolling interests		0
Payments for Repurchase of Common Stock	(1,266)	(904)
Dividends paid	(59,493)	(39,720)
Proceeds from issuance of common stock under employee stock purchase plan	542	555
Intercompany borrowings (advances), net	(74,526)	(74,408)
Net cash provided by financing activities	4,244	83,702
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	9,784	(183,428)
Cash and cash equivalents at beginning of period	19,002	4,559
Cash and cash equivalents at end of period	9,218	187,987
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	79,349	45,157
Cash flows from investing activities:
Capital expenditures	(46,587)	(31,397)
Proceeds from sale of long-lived assets	15,530	16
Contributions to equity method investments	(9,627)	(3,448)
Proceeds from sale of common units of equity method investee		0
Distributions in excess of equity in earnings of affiliates	13,410	13,778
Net cash used in investing activities	(27,274)	(21,051)
Cash flows from financing activities:
Debt issuance costs	0
Proceeds from Issuance of Long-term Debt	0	165,500
Principal payments on credit facilities and other obligations	(11)	(124,514)
Proceeds from issuance of common shares, net of offering costs		0
Debt extinguishment costs	0
Distributions to noncontrolling interests		(21,485)
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	(52,064)	(45,578)
Net cash provided by financing activities	(52,075)	(26,077)
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	0	1,971
Cash and cash equivalents at beginning of period	0	9,058
Cash and cash equivalents at end of period	0	7,087
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	24,014	29,602
Cash flows from investing activities:
Capital expenditures	(161,552)	(96,187)
Proceeds from sale of long-lived assets	633	98
Contributions to equity method investments	0	0
Proceeds from sale of common units of equity method investee		0
Distributions in excess of equity in earnings of affiliates	0	0
Net cash used in investing activities	(160,919)	(96,089)
Cash flows from financing activities:
Debt issuance costs	0
Proceeds from Issuance of Long-term Debt	0	0
Principal payments on credit facilities and other obligations	0	0
Proceeds from issuance of common shares, net of offering costs		0
Debt extinguishment costs	0
Distributions to noncontrolling interests		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	124,397	79,207
Net cash provided by financing activities	124,397	79,207
Effect of exchange rate changes on cash and cash equivalents	2,418	1,943
Change in cash and cash equivalents	10,090	(14,663)
Cash and cash equivalents at beginning of period	59,796	46,043
Cash and cash equivalents at end of period	49,706	60,706
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	0	(25,448)
Cash flows from investing activities:
Capital expenditures	0	0
Proceeds from sale of long-lived assets	0	0
Contributions to equity method investments	0	0
Proceeds from sale of common units of equity method investee		0
Distributions in excess of equity in earnings of affiliates	0	(13,767)
Net cash used in investing activities	0	(13,767)
Cash flows from financing activities:
Debt issuance costs	0
Proceeds from Issuance of Long-term Debt	0	0
Principal payments on credit facilities and other obligations	0	0
Proceeds from issuance of common shares, net of offering costs		0
Debt extinguishment costs	0
Distributions to noncontrolling interests		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	2,193	40,779
Net cash provided by financing activities	2,193	40,779
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	(2,193)	(1,564)
Cash and cash equivalents at beginning of period	(4,582)	(1,564)
Cash and cash equivalents at end of period	$ (2,389)	$ 0