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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Cash flows from operating activities |  |
Net income | $ 18,603 | $ 16,817
Adjustment to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 10,555 | 10,116
Amortization of contract acquisition costs | 255 | 256
Amortization of debt issuance costs | 175 | 153
Imputed interest expense | 346 | 64
Provision for doubtful accounts | 76 | 40
Loss (gain) on disposal of assets | (107) | 110
Impairment losses | 0 | 1,800
Deferred income taxes | 3,975 | (1,222)
Excess tax benefit from equity-based awards | (800) | (462)
Equity-based compensation expense | 3,191 | 3,388
(Gain) loss on foreign currency derivatives | (433) | (299)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable | 5,012 | 3,031
Prepaids and other assets | (7,630) | (7,826)
Accounts payable and accrued expenses | (19,399) | (15,526)
Deferred revenue and other liabilities | (7,325) | 4,224
Net cash provided by operating activities | 6,494 | 14,664
Cash flows from investing activities |  |
Proceeds from grant for property, plant and equipment | 0 | 110
Purchases of property, plant and equipment, net of acquisitions | (4,105) | (6,484)
Acquisitions, net of cash acquired of $0 and $1,373, respectively | 0 | (4,627)
Net cash used in investing activities | (4,105) | (11,001)
Cash flows from financing activities |  |
Proceeds from line of credit | 366,950 | 248,550
Payments on line of credit | (359,950) | (227,550)
Proceeds from other debt | 3,709 | 6,821
Payments on other debt | (1,338) | (655)
Dividends distributed to noncontrolling interest | (1,109) | (720)
Proceeds from exercise of stock options | 539 | 342
Excess tax benefit from equity-based awards | 800 | 462
Purchase of treasury stock | (9,850) | (22,656)
Payments of debt issuance costs | 0 | (419)
Net cash provided by (used in) financing activities | (249) | 4,175
Effect of exchange rate changes on cash and cash equivalents | 3,926 | 8,552
Increase in cash and cash equivalents | 6,066 | 16,390
Cash and cash equivalents, beginning of period | 164,485 | 156,371
Cash and cash equivalents, end of period | 170,551 | 172,761
Supplemental disclosures |  |
Cash paid for interest | 1,048 | 873
Cash paid for income taxes | 1,751 | 1,887
Non-cash investing and financing activities |  |
Landlord incentives credited to deferred rent | $ 0 | $ 604

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration