CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 10,798	$ (492)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Depreciation and amortization	14,554	14,751
Provision for doubtful accounts	71	291
Amortization of debt discount and debt issuance costs	118	140
Stock-based compensation	1,728	1,224
Income from discontinued operations, net of tax		(390)
Loss on deconsolidation of subsidiary		19,937
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable, net	(9,794)	5,142
Materials and supplies, prepayments, and other current assets	(1,425)	(1,247)
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities	1,652	(5,756)
Accrued taxes	4,363	5,952
Other assets	(2,022)	(27)
Other liabilities	8,286	(4,660)
Net cash provided by (used in) operating activities of continuing operations	28,329	34,865
Net cash provided by (used in) operating activities of discontinued operations		589
Net cash provided by (used in) operating activities	28,329	35,454
Cash flows from investing activities:
Capital expenditures	(16,445)	(13,812)
Acquisition of business		(2,600)
Purchase of marketable securities	(2,000)
Change in restricted cash	653	39,635
Proceeds from disposition of long-lived assets		5,873
Net cash used in investing activities of continuing operations	(17,792)	29,096
Cash flows from financing activities:
Dividends paid on common stock	(5,145)	(4,618)
Distribution to minority stockholders	(3,036)	(3,066)
Payment of debt issuance costs		(30)
Proceeds from stock option exercises	165	277
Principal repayments of term loan	(1,535)	(1,483)
Purchase of common stock	(1,929)	(1,513)
Net cash provided by financing activities of continuing operations	(11,480)	(10,433)
Net change in cash and cash equivalents	(943)	54,117
Cash and cash equivalents, beginning of period	392,045	326,216
Cash and cash equivalents, end of period	$ 391,102	$ 380,333