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Other noncurrent assets	6 Months Ended
Other noncurrent assets	Jun. 30, 2014
Other noncurrent assets [Abstract]
Other Assets Disclosure	8. Other noncurrent assets Other noncurrent assets primarily consisted of core return rights of $41,555,000 and noncurrent deferred tax assets of $21,128,000 as of June 30, 2014. Other noncurrent assets primarily consisted of core return rights of $37,250,000 and noncurrent deferred tax assets of $22,113,000 as of December 31, 2013.