Stock-Based Compensation - Equity-Classified Stock Compensation (Non-Qualified Stock Option Awards) - Additional Information (Details) - USD ($)						1 Months Ended		12 Months Ended
	Feb. 26, 2016	Jun. 29, 2015	May 20, 2015	Feb. 09, 2015	Jan. 23, 2013	May 31, 2015	Feb. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2011
2010 Plan [Member] | Mr Albright [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted	40,000					40,000	20,000
Options granted exercise price	$ 55.62
2010 Plan [Member] | Mr Patten [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted exercise price					$ 34.95
Non-Qualified Stock Option Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiry of option								(a) the tenth anniversary of the grant date; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.
Percent of options vested in each anniversaries, description								One-third of these options will vest on each of the first, second, and third anniversaries of the grant date, provided the recipient is an employee of the Company on those dates.
Non-Qualified Stock Option Award [Member] | Mr Patten [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiry of option								: (a) the fifth anniversary of the grant date; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.
Non-Qualified Stock Option Award [Member] | 2010 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted					51,000
Expiry of option		(a) June 29, 2025; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.
Stock based compensation, Shares, Granted		10,000						40,000	70,000	10,000
Percent of options vested in each anniversaries, description		One-third of the option will vest on each of the first, second, and third anniversaries of the grant date, provided the recipient is an employee of the Company on those dates.
Options granted exercise price		$ 57.54						$ 55.62	$ 56.43	$ 50.00
Weighted-average grant-date fair value of options granted								$ 13.97
Total intrinsic value of options exercised								$ 51,000
Unrecognized compensation cost								$ 354,000
Weighted average period of compensation cost to be recognized								1 year 4 months 24 days
Non-Qualified Stock Option Award [Member] | 2010 Plan [Member] | Mr Albright [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted	40,000
Expiry of option	(a) January 28, 2025; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.
Stock based compensation, Shares, Granted			40,000	20,000
Percent of options vested in each anniversaries, description	One-third of the options vested immediately and the remaining two-thirds will vest on January 28, 2017 and January 28, 2018, provided he is an employee of the Company on such dates.
Options granted exercise price			$ 55.62	$ 57.50
Non-Qualified Stock Option Award [Member] | 2010 Plan [Member] | Mr Patten [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted					10,000
Non-Qualified Stock Option Award [Member] | 2010 Plan [Member] | Albright, Patten, and Smith
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted										10,000	10,000	50,000