Shareholders' Equity and Common Stock Equivalents - Restricted Stock Activity (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Total Outstanding Units
Beginning balance, Total Outstanding, Units (in shares) | shares	1,008,249
Granted, Total Outstanding Units (in shares) | shares	210,712
Adjustment for performance achievement, Total Outstanding Units (in shares) | shares	(3,789)
Vested, Total Outstanding Units (in shares) | shares	0
Forfeited, Total Outstanding Units (in shares) | shares	(34,895)
Distributed, Total Outstanding Units (in shares) | shares	(290,839)
Ending balance, Total Outstanding, Units (in shares) | shares	889,438
Total Outstanding Units, Weighted Average Grant Date Fair Value per Unit
Beginning balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	$ 35.64
Granted, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	41.52
Adjustment for performance achievement, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	32.16
Vested, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	0
Forfeited, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	43.08
Distributed, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	31.39
Ending balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	$ 31.94
Vested Units
Beginning balance, Vested, Units (in shares) | shares	417,179
Granted, Vested, Units (in shares) | shares	0
Adjustment for performance achievement, Units (in shares) | shares	0
Vested, Vested, Units (in shares) | shares	417,454
Forfeited, Vested, Units (in shares) | shares	0
Distributed, Vested, Units (in shares) | shares	(290,839)
Ending balance, Vested, Units (in shares) | shares	543,794
Vested Units, Weighted Average Grant Date Fair Value per Unit
Beginning balance, Vested, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	$ 20.22
Granted, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	0
Adjustment for performance achievement, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	0
Vested, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	33.93
Forfeited, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	0
Distributed, Vested, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	31.39
Ending balance, Vested, Weighted Average Grant Date Fair Value per Unit (in usd per share) | $ / shares	$ 24.77