Summary of Significant Accounting Policies Related Party Narrative (Details) $ in Thousands, ¥ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2015 JPY (¥)
Derivative, Notional Amount | ¥				¥ 697	¥ 661
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 58	$ 100
Change in unrealized loss on hedge contracts	0	0	$ (40)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	40
Entity employee [Member]
Due from Related Parties	$ 100	$ 100