| Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets
The changes in the carrying amounts of goodwill by reportable segment for the years ended December 31, 2014 and 2013 are as follows (in thousands): | | | | | | | | | | | | | | PBM | | HCIT | | Total | Balance at December 31, 2012 | $ | 4,458,373 |
| | $ | 19,665 |
| | $ | 4,478,038 |
| Acquisitions (1) | 225,761 |
| | — |
| | 225,761 |
| Measurement period adjustments (2) | 16,476 |
| | — |
| | 16,476 |
| Balance at December 31, 2013 | 4,700,610 |
| | 19,665 |
| | 4,720,275 |
| Acquisitions (3) | 2,026 |
| | — |
| | 2,026 |
| Measurement period adjustments (4) | 2,338 |
| | — |
| | 2,338 |
| Balance at December 31, 2014 | $ | 4,704,974 |
| | $ | 19,665 |
| | $ | 4,724,639 |
|
| | (1) | Initial goodwill recorded in connection with the acquisition of Restat in October 2013 and another insignificant acquisition in 2013. |
| | (2) | Adjustments to the fair value of assets acquired and liabilities assumed for recent acquisitions during the measurement period. The measurement period adjustments were not recast to the 2012 consolidated financial statements as they were not deemed material. |
| | (3) | Represents adjustments to purchase price for the Restat acquisition, including settlement of working capital adjustment. |
| | (4) | Represents adjustments in connection with the post-closing working capital adjustment as well as changes in the estimated fair values of the associated assets acquired and liabilities assumed for Restat acquisition during the measurement period. The measurement period adjustments were not recast to the 2013 consolidated financial statements as they were not deemed material. |
Definite-lived intangible assets are amortized over the useful lives of the related assets. The components of intangible assets were as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2014 | | December 31, 2013 | | Gross Carrying Amount | | Accumulated Amortization | | Net | | Gross Carrying Amount | | Accumulated Amortization | | Net | Customer relationships | $ | 1,527,722 |
| | $ | 564,623 |
| | $ | 963,099 |
| | $ | 1,528,475 |
| | $ | 355,737 |
| | $ | 1,172,738 |
| Non-compete agreements | 11,920 |
| | 7,435 |
| | 4,485 |
| | 13,430 |
| | 6,463 |
| | 6,967 |
| Other intangible assets | 3,060 |
| | 2,445 |
| | 615 |
| | 3,060 |
| | 1,346 |
| | 1,714 |
| Total | $ | 1,542,702 |
| | $ | 574,503 |
| | $ | 968,199 |
| | $ | 1,544,965 |
| | $ | 363,546 |
| | $ | 1,181,419 |
|
Future amortization associated with intangible assets recorded as of December 31, 2014 is estimated to be $194.0 million in 2015, $166.7 million in 2016, $147.5 million in 2017, $137.2 million in 2018, $126.8 million in 2019, and $196.0 million for years after 2019. |