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Intangible Assets Other Than Goodwill | 3 Months Ended
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Mar. 31, 2013
Intangible Assets Other Than Goodwill | Note 13 — Intangible Assets Other Than Goodwill Intangible assets other than goodwill consist primarily of licenses, product lines, customer relationships and trademarks. Amortized intangible assets are included in Intangibles in the accompanying balance sheets. Trademarks are disclosed separately in the accompanying balance sheets. Debt offering costs from the issuance of the Company’s convertible senior notes are included in Other Long Term Assets in the accompanying balance sheets. Intangible assets and debt issuance costs are as follows (in thousands, except for weighted useful lives):
|  |  | December 31, 2012 |  |  | March 31, 2013
| Weighted Useful Lives |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount
| (Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licenses | 4.96 |  | $ | 91,488 |  |  | $ | (77,844) |  |  | $ | 13,644 |  |  | $ | 91,488 |  |  | $ | (78,164) |  | $ | 13,324
Product lines | 5.84 |  |  | 66,594 |  |  |  | (19,561) |  |  |  | 47,033 |  |  |  | 66,594 |  |  |  | (19,923) |  |  | 46,671
Customer relationships | 5.21 |  |  | 9,347 |  |  |  | (5,903) |  |  |  | 3,444 |  |  |  | 9,347 |  |  |  | (6,084) |  |  | 3,263
Trade names | 5.00 |  |  | 3,000 |  |  |  | (250) |  |  |  | 2,750 |  |  |  | 3,000 |  |  |  | (400) |  |  | 2,600
Non-compete/Employment contracts | 3.90 |  |  | 3,333 |  |  |  | (3,150) |  |  |  | 183 |  |  |  | 3,333 |  |  |  | (3,160) |  |  | 173
Total amortized intangible assets |  |  |  | 173,762 |  |  |  | (106,708) |  |  |  | 67,054 |  |  |  | 173,762 |  |  |  | (107,731) |  |  | 66,031
Deferred Costs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs | 2.79 |  |  | 4,224 |  |  |  | (2,609) |  |  |  | 1,615 |  |  |  | 4,224 |  |  |  | (3,059) |  |  | 1,165
Unamortized Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 2,308 |  |  |  | ― |  |  |  | 2,308 |  |  |  | 2,308 |  |  |  | ― |  |  | 2,308
Total Intangible Assets: |  |  | $ | 180,294 |  |  | $ | (109,317) |  |  | $ | 70,977 |  |  | $ | 180,294 |  |  | $ | (110,790) |  | $ | 69,504
Amortization expense related to limited life intangible assets and debt offering costs was $0.7 million and $1.5 million for the three months ended March 31, 2012 and 2013, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -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 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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