Changes in Operations United States Pinsly (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 05, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues		$ 516,534	$ 501,002	$ 501,375	$ 482,616	$ 514,853	$ 546,299	$ 542,219	$ 397,030
Operating Income		$ 53,571	$ 91,851	$ 87,194	$ 56,996	$ 94,631	$ 117,559	$ 99,451	$ 72,620	$ 289,612	$ 384,261	$ 421,571
Pinsly [Member]
Business Acquisition, Effective Date of Acquisition	Jan. 05, 2015
Cash consideration	$ 41,300
Revenues											14,500
Operating Income											$ 2,600