Summary of Significant Accounting Policies (Details) - USD ($)	3 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	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Deferred income tax asset, noncurrent	$ 32,000,000				$ 35,700,000				$ 32,000,000	$ 35,700,000
Deferred income tax liability, noncurrent	1,800,000				5,400,000				1,800,000	5,400,000
Capitalized cost of internal use software	8,100,000				4,100,000				8,100,000	4,100,000
Goodwill impairment loss									0
Revenue	354,400,000	$ 273,300,000	$ 254,600,000	$ 225,000,000	295,400,000	$ 243,200,000	$ 247,600,000	$ 198,000,000	1,107,300,000	984,200,000	$ 934,200,000
Intangible assets, amortization expense									7,100,000	3,900,000	2,300,000
Unbilled Revenues
Property, Plant and Equipment [Line Items]
Revenue									61,500,000	57,500,000
Accounts Payable
Property, Plant and Equipment [Line Items]
Unbilled trade payables	$ 7,800,000				3,400,000				$ 7,800,000	3,400,000
Minimum | Internal Use Software
Property, Plant and Equipment [Line Items]
Capitalized software costs, useful lives									3 years
Minimum | Acquired Intangible Assets
Property, Plant and Equipment [Line Items]
Intangible assets, useful lives									1 year
Minimum | Land Improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P20Y
Minimum | Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P20Y
Minimum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P3Y
Maximum | Internal Use Software
Property, Plant and Equipment [Line Items]
Capitalized software costs, useful lives									10 years
Maximum | Internet Web Site Costs
Property, Plant and Equipment [Line Items]
Capitalized software costs, useful lives									3 years
Maximum | Acquired Intangible Assets
Property, Plant and Equipment [Line Items]
Intangible assets, useful lives									15 years
Maximum | Land Improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P35Y
Maximum | Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P50Y
Maximum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful lives									P20Y
Selling, General and Administrative Expenses
Property, Plant and Equipment [Line Items]
Intangible assets, amortization expense										4,000,000	$ 2,300,000
Adjustments for New Accounting Pronouncement
Property, Plant and Equipment [Line Items]
Deferred income tax asset, current					(23,200,000)					(23,200,000)
Deferred income tax liability, current					$ (4,100,000)					$ (4,100,000)