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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 53,167 $ 21,897 $ 37,582
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Bargain purchase gain, net of tax     (27,024)
Depreciation and amortization 105,487 104,159 76,736
Provision for doubtful accounts 14,006 14,822 17,261
Amortization and write off of debt discount and debt issuance costs 2,388 1,962 1,428
Stock-based compensation 3,543 3,249 2,043
Deferred income taxes 7,356 27,580 (348)
Equity in earnings of unconsolidated affiliates (3,535) (3,029) (743)
Gain on disposition of long-lived assets (11,605) (2,397)  
Impairment of intangibles 3,350 2,425  
Changes in operating assets and liabilities, excluding the effects of acquisitions:      
Accounts receivable, net (15,473) (23,202) (15,555)
Materials and supplies, prepayments, and other current assets (6,562) 11,089 (26,281)
Prepaid income taxes 11,545 (1,922)  
Accounts payable and accrued liabilities (1,441) (11,024) 52,261
Accrued taxes 21,953 (10,323) (3,461)
Other 3,292 (2,683) (11,098)
Net cash provided by operating activities 187,471 132,603 102,801
Cash flows from investing activities:      
Capital expenditures (77,421) (101,401) (135,688)
Acquisitions of businesses     (225,551)
Acquisitions of assets     (57)
Cash acquired in business combinations   4,087 53
Proceeds from disposition of long-lived assets 15,163 1,200  
Decrease in restricted cash   467 4,782
Net cash used in investing activities (62,258) (95,647) (356,461)
Cash flows from financing activities:      
Dividends paid on common stock (18,491) (13,703) (12,569)
Distribution to minority stockholders (3,389) (2,814) (1,870)
Payment of debt issuance costs (3,564) (1,037) (4,321)
Proceeds from stock option exercises 1,452 1,175 1,652
Principal repayments of term loan (260,793) (13,450) (49,568)
Principal repayments of revolver loan (74,534) (132,911)  
Purchase of common stock (344) (218) (44)
Investments made by minority shareholders in consolidated affiliates 1,061 784 3,463
Proceeds from borrowings under term loan 275,000   200,000
Proceeds from borrowings under revolver loan 46,378 137,069 64,000
Repurchase of non-controlling interests (77) (446)  
Net cash provided by (used in) financing activities (37,301) (25,551) 200,743
Net change in cash and cash equivalents 87,912 11,405 (52,917)
Cash and cash equivalents, beginning of year 48,735 37,330 90,247
Cash and cash equivalents, end of year 136,647 48,735 37,330
Supplemental cash flow information:      
Interest paid 14,388 18,173 11,518
Taxes paid (refunded), net $ (2,704) $ 3,902 $ 24,974