Shareholders' Equity - Summary of Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Options
Options outstanding, Beginning Balance (in shares) | shares	162,665
Options, Granted (in shares) | shares	0
Options, Exercised (in shares) | shares	0
Options, Forfeited or expired (in shares) | shares	(8,753)
Options outstanding, Ending Balance (in shares) | shares	153,912
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding, Beginning Balance (in USD per share) | $ / shares	$ 43.11
Weighted Average Exercise Price, Granted (in USD per share) | $ / shares	0.00
Weighted Average Exercise Price, Exercised (in USD per share) | $ / shares	0.00
Weighted Average Exercise Price, Forfeited or expired (in USD per share) | $ / shares	59.12
Weighted Average Exercise Price, Outstanding, Ending Balance (in USD per share) | $ / shares	$ 42.20
Share-based Compensation Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	6 years 1 month 13 days
Aggregate Intrinsic Value, Outstanding | $	$ 0
Options Vested [Abstract]
Options, Vested (in shares) | shares	112,567
Weighted Average Exercise Price, Vested (in USD per share) | $ / shares	$ 49.37
Weighted Average Remaining Contractual Term, Vested	5 years 6 months 29 days
Aggregate Intrinsic Value, Vested | $	$ 0