Equity (Details 4) shares in Thousands	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Equity Instruments, Options, Nonvested Shares Roll-Forward
Non-vested shares, Beginning Balance | shares	25
Non-vested shares, forfeited, or expired | shares	(4)
Non-vested shares, vested | shares	(5)
Stock Options Outstanding, Ending Balance | shares	16
Weighted Average Grant Date Fair Value, Options Nonvested at beginning of period | $ / shares	$ 28.61
Weighted Average Grant Date Fair Value, Options nonvested, forfeited in period | $ / shares	28.80
Weighted Average Grant Date Fair Value, Options nonvested, vested in period | $ / shares	38.06
Weighted Average Grant Date Fair Value, Options nonvested at end of period | $ / shares	$ 26.47