Goodwill and Other Intangible Assets | 7. Goodwill and Other Intangible Assets The carrying value of goodwill by segment was as follows (in thousands): Medical & RF Technology Industrial Technology Energy Systems Total Balances at December 31, 2015 $ 3,039,197 $ 1,993,299 $ 374,033 $ 418,197 $ 5,824,726 Goodwill acquired 145,411 - - - 145,411 Other (375 ) 1,467 - - 1,092 Currency translation adjustments 6,839 (2,735 ) 589 (119 ) 4,574 Balances at March 31, 2016 $ 3,191,072 $ 1,992,031 $ 374,622 $ 418,078 $ 5,975,803 Other relates to tax purchase accounting adjustments for 2015 acquisitions. Other intangible assets were comprised of (in thousands): Cost Accumulated amortization Net book value Assets subject to amortization: Customer related intangibles $ 2,448,509 $ (602,615 ) $ 1,845,894 Unpatented technology 270,170 (117,405 ) 152,765 Software 161,201 (44,298 ) 116,903 Patents and other protective rights 24,160 (18,659 ) 5,501 Backlog 700 (700 ) - Trade names 595 (122 ) 473 Assets not subject to amortization: Trade names 407,460 - 407,460 Balances at December 31, 2015 $ 3,312,795 $ (783,799 ) $ 2,528,996 Assets subject to amortization: Customer related intangibles $ 2,545,037 $ (636,565 ) $ 1,908,472 Unpatented technology 307,543 (129,788 ) 177,755 Software 154,366 (41,742 ) 112,624 Patents and other protective rights 24,190 (19,189 ) 5,001 Backlog 700 (700 ) - Trade names 570 (130 ) 440 Assets not subject to amortization: Trade names 417,865 - 417,865 Balances at March 31, 2016 $ 3,450,271 $ (828,114 ) $ 2,622,157 Amortization expense of other intangible assets was $49,048 and $37,859 during the three months ended March 31, 2016 and 2015, respectively. An evaluation of the carrying value of goodwill and indefinite-lived intangibles is required to be performed on an annual basis and on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. There have been no events or changes in circumstances which indicate an interim impairment review is required in 2016. The Company expects to perform the annual analysis during the fourth quarter. |