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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) [Abstract] |  |  |
Depreciation and amortization | $ 503,662 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization | $ 238,153 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization | $ 229,072 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization
Non-cash stock-based compensation expense | $ 28,299 us-gaap_ShareBasedCompensation | $ 25,978 us-gaap_ShareBasedCompensation | $ 25,520 us-gaap_ShareBasedCompensation

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- Definition Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Details
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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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