Stockholders' Equity (Stock Split) (Narrative) (Details)	Jul. 14, 2015	Jun. 30, 2015	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares	Mar. 31, 2015 $ / shares shares	Feb. 28, 2015 $ / shares shares
Stockholders' Equity Note [Abstract]
Capital units, authorized					5,000,000,000	170,000,000
Common stock, shares authorized			4,990,000,000	4,990,000,000	4,990,000,000	160,000,000
Preferred stock, shares authorized			10,000,000	10,000,000	10,000,000	10,000,000
Common stock, par value (in USD per share) | $ / shares			$ 0.001	$ 0.001	$ 0.001	$ 0.001
Stock split, conversion ratio	7	7