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Reportable Segments and Geographic Information - Reportable Segments (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 241,310 | $ 248,863 | $ 255,062 | $ 252,873 | $ 262,809 | $ 247,453 | $ 239,153 | $ 209,738 | $ 507,935 | $ 448,891 | $ 756,798 | $ 696,344 | $ 998,108 | $ 959,153 | $ 862,772
Gross Margin |  |  |  |  |  |  |  |  |  |  |  |  | 503,062 | 454,760 | 391,794
Total assets | 2,685,143 |  |  |  | 2,843,634 |  |  |  |  |  |  |  | 2,685,143 | 2,843,634 | 2,213,010
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 256,142 | 383,841 | 291,530
Contract Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | 191,692 | 198,259 | 202,261 |  | 191,000 | 181,940 | 156,523 | 400,520 | 338,463 | 592,212 | 529,463 | 781,166 | 729,103 | 627,844
Aftermarket Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 57,171 | $ 56,803 | $ 50,612 |  | $ 56,453 | $ 57,213 | $ 53,215 | $ 107,415 | $ 110,428 | $ 164,586 | $ 166,881 | 216,942 | 230,050 | 234,928
Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 998,108 | 959,153 | 862,772
Gross Margin |  |  |  |  |  |  |  |  |  |  |  |  | 503,062 | 454,760 | 391,794
Total assets | 2,397,199 |  |  |  | 2,509,118 |  |  |  |  |  |  |  | 2,397,199 | 2,509,118 | 1,974,790
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 229,544 | 372,559 | 276,343
Reportable Segments | Contract Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 781,166 | 729,103 | 627,844
Gross Margin |  |  |  |  |  |  |  |  |  |  |  |  | 461,765 | 412,961 | 345,355
Total assets | 2,248,191 |  |  |  | 2,446,633 |  |  |  |  |  |  |  | 2,248,191 | 2,446,633 | 1,907,097
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 227,248 | 371,734 | 275,408
Reportable Segments | Aftermarket Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 216,942 | 230,050 | 234,928
Gross Margin |  |  |  |  |  |  |  |  |  |  |  |  | 41,297 | 41,799 | 46,439
Total assets | 149,008 |  |  |  | 62,485 |  |  |  |  |  |  |  | 149,008 | 62,485 | 67,693
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 2,296 | 825 | 935
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other financial information by reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross Margin |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ 287,944 |  |  |  | $ 334,516 |  |  |  |  |  |  |  | 287,944 | 334,516 | 238,220
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,598 | $ 11,282 | $ 15,187

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