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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (58,143) | $ (15,203)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Asset impairment | 67 | 157
Depreciation and amortization expense | 15,431 | 19,295
Bad debt expense | 5,852 | 6,702
Compensation expense related to share-based awards | 1,341 | 1,775
Loss on sale of business |  | 6,712
Loss on disposition of property and equipment | 26 | 94
Changes in operating assets and liabilities | 6 | (33,729)
Net cash used in operating activities | (35,420) | (14,197)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of available-for-sale investments | (29,810) | (13,540)
Sales of available-for-sale investments | 14,320 | 13,465
Purchases of property and equipment | (3,468) | (4,077)
Payments of cash upon sale of business |  | (1,947)
Other |  | (1)
Net cash used in investing activities | (18,958) | (6,100)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Issuance of common stock | 196 | 304
Payment on borrowings |  | (80,000)
Change in restricted cash | (384) | 86,470
Payments of capital lease obligations |  | (74)
Net cash (used in) provided by financing activities | (188) | 6,700
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: | 10 | (3,194)
NET DECREASE IN CASH AND CASH EQUIVALENTS | (54,556) | (16,791)
DISCONTINUED OPERATIONS CASH ACTIVITY INCLUDED ABOVE: |  |
Add: Cash balance of discontinued operations, beginning of the period | 182 | 127,925
Less: Cash balance of discontinued operations, end of the period | 199 | 114,428
CASH AND CASH EQUIVALENTS, beginning of the period | 318,761 | 112,697
CASH AND CASH EQUIVALENTS, end of the period | $ 264,188 | $ 109,403

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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