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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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