Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Operating activities:
Cash provided by operating activities	$ 30,284	$ 47,998
Investing activities:
Capital expenditures	(25,519)	(21,328)
Proceeds from sale of equipment	64	506
Proceeds from maturities of certificates of deposit	1,000	4,580
Proceeds from sale of equity method investments	8,000
Cash used in investing activities	(16,455)	(16,242)
Financing activities:
Payments on bank debt	(27,280)	(27,875)
Borrowings on bank debt	19,000
Debt issuance cost	(730)
Proceeds from noncontrolling interests (Note 13)	4,000
Dividends	(3,707)	(3,651)
Cash used in financing activities	(8,717)	(31,526)
Increase in cash, cash equivalents, and restricted cash	5,112	230
Cash, cash equivalents, and restricted cash, beginning of period	16,294	12,605
Cash, cash equivalents, and restricted cash, end of period	21,406	12,835
Cash and cash equivalents			$ 16,903	$ 12,483	$ 9,407
Restricted cash			4,503	3,811	3,428
Total cash, cash equivalents, and restricted cash	16,294	$ 12,605	$ 21,406	$ 16,294	$ 12,835
Liabilities assumed	$ 1,100