Acquisitions (MSB) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015
Business Acquisition [Line Items]
Net revenues	$ 348,488,000
Net income	6,325,000
MSB/DQ Member [Domain]
Business Acquisition [Line Items]
Goodwill, Acquired During Period		307,773,000
Data and Analytics [Member] | MSB/DQ Member [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		36,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		9,227,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		2,190,000
Business Combination, Recognized Intangible Assets Acquired, Deferred Tax Asset Current		6,658,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		177,311,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		129,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent		29,760,000
Business Combination, Recognized Intangible Assets Acquired, equity method investment		18,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		680,655,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		3,911,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		22,371,000
business acquisition, recognized identifiable assets acquired, deferred revenue non current		1,823,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		652,519,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 167,800,000