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Operations and Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the beginning of the year | $ 46,026 |
Accumulated amortization, balance at the beginning of the year | (18,170) |
Net carrying amount, balance at the beginning of the year | 27,856 |
Amortization | (7,800) |
Gross carrying amount, balance at the end of the year | 69,693 |
Accumulated amortization, balance at the end of the year | (19,095) |
Net carrying amount, balance at the end of the year | 50,598 |
Estimated future amortization of intangible assets |  |
2013 | 9,260 |
2014 | 8,984 |
2015 | 6,426 |
2016 | 6,134 |
2017 | 4,401 |
Thereafter | 15,393 |
Total | 50,598 |
Patents |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the beginning of the year | 6,681 | 6,921
Accumulated amortization, balance at the beginning of the year | (4,767) | (4,384)
Net carrying amount, balance at the beginning of the year | 1,914 | 2,537
Amortization | (610) | (620)
Foreign exchange | 3 | (3)
Removal of fully amortized asset, gross |  | (237)
Accumulated amortization of removal of fully amortized asset |  | 237
Gross carrying amount, balance at the end of the year | 6,684 | 6,681
Accumulated amortization, balance at the end of the year | (5,377) | (4,767)
Net carrying amount, balance at the end of the year | 1,307 | 1,914
Unpatented Technology |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the beginning of the year | 4,129 | 2,848
Accumulated amortization, balance at the beginning of the year | (1,395) | (879)
Net carrying amount, balance at the beginning of the year | 2,734 | 1,969
Amortization | (622) | (516)
Foreign exchange | 32 | (66)
Reclassifications | 1,200 | 1,347
Gross carrying amount, balance at the end of the year | 5,361 | 4,129
Accumulated amortization, balance at the end of the year | (2,017) | (1,395)
Net carrying amount, balance at the end of the year | 3,344 | 2,734
Non-Compete Agreements, Trademarks and Other |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the beginning of the year | 16,276 | 9,128
Accumulated amortization, balance at the beginning of the year | (5,361) | (4,311)
Net carrying amount, balance at the beginning of the year | 10,915 | 4,817
Acquisition | 32,355 | 9,026
Disposal, Gross carrying amount | (2,212) |
Disposal, Accumulated amortization | 1,628 |
Disposal, Net carrying amount | (584) |
Amortization | (4,309) | (1,297)
Foreign exchange | (2) | (19)
Reclassifications | (4,426) | (1,612)
Removal of fully amortized asset, gross | (5,040) | (247)
Accumulated amortization of removal of fully amortized asset | 5,040 | 247
Gross carrying amount, balance at the end of the year | 36,951 | 16,276
Accumulated amortization, balance at the end of the year | (3,002) | (5,361)
Net carrying amount, balance at the end of the year | 33,949 | 10,915
Customer Relationships |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the beginning of the year | 18,940 | 19,757
Accumulated amortization, balance at the beginning of the year | (6,647) | (5,614)
Net carrying amount, balance at the beginning of the year | 12,293 | 14,143
Amortization | (2,052) | (1,893)
Foreign exchange | 57 | (112)
Reclassifications | 1,700 | 155
Removal of fully amortized asset, gross |  | (860)
Accumulated amortization of removal of fully amortized asset |  | 860
Gross carrying amount, balance at the end of the year | 20,697 | 18,940
Accumulated amortization, balance at the end of the year | (8,699) | (6,647)
Net carrying amount, balance at the end of the year | 11,998 | 12,293
North America |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the end of the year | 37,992 | 32,912
Accumulated amortization, balance at the end of the year | (12,012) | (13,288)
Net carrying amount, balance at the end of the year | 25,980 | 19,624
Europe |  |
Changes in gross carrying amount of finite-lived intangible assets |  |
Gross carrying amount, balance at the end of the year | 31,701 | 13,114
Accumulated amortization, balance at the end of the year | (7,083) | (4,882)
Net carrying amount, balance at the end of the year | $ 24,618 | $ 8,232

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