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Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	$ 373,501	[1]	$ 373,502	$ 356,185	$ 300,129	$ 343,660	[1]	$ 283,259	$ 261,934	$ 253,634	$ 1,403,317	$ 1,142,487	$ 1,061,681
Assets	603,788					573,495					603,788	573,495
Canadian Operation [Member]
Segment Reporting Information [Line Items]
Assets	$ 40,000					$ 45,500					40,000	45,500
CANADA
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net											84,100	36,500	1,500
TD [Member] | CANADA
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net											18,700	26,900	1,400
CI [Member] | CANADA
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net											$ 65,400	$ 9,600	$ 100
[1] Results for the fourth quarter of 2017 include a net Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively. See further discussion in Note 10 — Income Taxes to our Financial Statements.

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

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(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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