Company Information and Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Significant Accounting Policies [Line Items]
Net cash used by financing activities		$ 62,627	$ (10,152)	$ (54,397)
Net cash used by operating activities		(21,380)	88,409	103,658
Impact of adoption of new accounting pronouncement		$ 1,600
ASU 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
Significant Accounting Policies [Line Items]
Net cash used by financing activities				(4,900)
Net cash used by operating activities				$ 4,900
Income tax benefit	$ 700		$ 2,100