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Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated amortization for goodwill	$ 8,079	$ 8,079
Goodwill in discontinued operations	700
Goodwill [Roll Forward]
Balance, beginning of year	69,695	67,895
Acquisitions (Note 4)	95,131	4,510
Foreign currency adjustments	1,603	(2,710)
Balance, end of year	$ 166,429	$ 69,695

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For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges).

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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