The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_SoftwareDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Intangible Assets, Net - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Intangible assets
Gross Value	$ 36,843		$ 36,843		$ 36,557
Accumulated Amortization	(15,604)		(15,604)		(11,682)
Net Carrying Value	21,239		21,239		$ 24,875
Amortization expense for intangible assets	2,000	$ 1,000	$ 3,900	$ 2,100
Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			6 years 1 month 6 days		6 years 6 months
Client relationships
Intangible assets
Gross Value	22,581		$ 22,581		$ 22,581
Accumulated Amortization	(8,295)		(8,295)		(6,226)
Net Carrying Value	14,286		$ 14,286		$ 16,355
Client relationships \| Minimum
Intangible assets
Useful life			2 years		2 years
Client relationships \| Maximum
Intangible assets
Useful life			10 years		10 years
Client relationships \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			7 years 10 months 24 days		8 years 6 months
Non-compete agreements
Intangible assets
Gross Value	3,480		$ 3,480		$ 3,480
Accumulated Amortization	(2,743)		(2,743)		(2,344)
Net Carrying Value	737		$ 737		$ 1,136
Non-compete agreements \| Minimum
Intangible assets
Useful life			1 year 6 months		1 year 6 months
Non-compete agreements \| Maximum
Intangible assets
Useful life			5 years		5 years
Non-compete agreements \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			1 year 1 month 6 days		1 year 7 months 6 days
Trademarks
Intangible assets
Gross Value	1,320		$ 1,320		$ 1,320
Accumulated Amortization	(507)		(507)		(287)
Net Carrying Value	813		$ 813		$ 1,033
Useful life			3 years		3 years
Trademarks \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			2 years		2 years 4 months 24 days
Patents
Intangible assets
Gross Value	200		$ 200		$ 200
Accumulated Amortization	(39)		(39)		(6)
Net Carrying Value	161		$ 161		$ 194
Useful life			3 years		3 years
Patents \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			2 years 4 months 24 days		2 years 10 months 24 days
Internal-Use Software
Intangible assets
Gross Value	9,262		$ 9,262		$ 8,976
Accumulated Amortization	(4,020)		(4,020)		(2,819)
Net Carrying Value	$ 5,242		$ 5,242		$ 6,157
Internal-Use Software \| Minimum
Intangible assets
Useful life			3 years		3 years
Internal-Use Software \| Maximum
Intangible assets
Useful life			5 years		5 years
Internal-Use Software \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			2 years 4 months 24 days		3 years