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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities    
Net income $ 24,447 $ 35,528
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 34,950 31,043
Amortization of contract acquisition costs 334 537
Amortization of debt issuance costs 412 356
Imputed interest expense and fair value adjustments to contingent consideration 195 (123)
Provision for doubtful accounts 224 406
Gain on disposal of assets (41) (69)
Deferred income taxes 5,897 (341)
Excess tax benefit from equity-based awards (521) (409)
Equity-based compensation expense 4,584 5,278
(Gain) loss on foreign currency derivatives 62 2,600
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable 23,945 9,191
Prepaids and other assets (14,544) 790
Accounts payable and accrued expenses (21,442) 13,282
Deferred revenue and other liabilities (5,476) (12,556)
Net cash provided by operating activities 53,026 85,513
Cash flows from investing activities    
Proceeds from sale of long-live assets 63 116
Purchases of property, plant and equipment (27,743) (29,505)
Investments in non-marketable equity investments   (9,000)
Acquisitions, net of cash acquired of zero and zero, respectively (400) (1,775)
Net cash used in investing activities (28,080) (40,164)
Cash flows from financing activities    
Proceeds from line of credit 1,186,500 1,185,200
Payments on line of credit (1,151,500) (1,170,200)
Payments on other debt (1,214) (1,720)
Payments of contingent consideration and hold back payments to acquisitions (9,467) (11,883)
Dividends paid to shareholders (8,923) (8,710)
Payments to noncontrolling interest (2,202) (2,657)
Purchase of mandatorily redeemable noncontrolling interest (4,105)  
Proceeds from exercise of stock options 371 432
Excess tax benefit from equity-based awards 521 409
Payments of debt issuance costs (1,883) (35)
Purchase of treasury stock (36,111) (12,254)
Net cash used in financing activities (28,013) (21,418)
Effect of exchange rate changes on cash and cash equivalents (1,907) (7,405)
Increase (decrease) in cash and cash equivalents (4,974) 16,526
Cash and cash equivalents, beginning of period 60,304 77,316
Cash and cash equivalents, end of period 55,330 93,842
Supplemental disclosures    
Cash paid for interest 3,155 2,693
Cash paid for income taxes 13,705 7,761
Non-cash investing and financing activities    
Acquisition of long lived assets through capital leases 2,667 5,353
Acquisition of equipment through increase in accounts payable, net 289 $ 2,625
Contract acquisition costs credited to accounts receivable $ 200