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Equity Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 5,343,000	$ 5,121,000	$ 3,550,000
Tax benefit recognized	0	0	0
Share-based compensation expense recognized	$ 16,495,000	$ 14,615,000	11,697,000
Time-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognizing cost	2 years
Options awarded	52	65
Stock options compensation costs	$ 1,432,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognizing cost	1 year 6 months
Total fair value of restricted stock vested	$ 11,864,000	$ 6,235,000	5,102,000
Unrecognized compensation costs related to non-vested performance options	$ 18,766,000
Performance options awarded to President and CEO	630	771
Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiry of options from the date of grant	10 years
Weighted average period of recognizing cost	1 year 10 months 24 days
Share-based compensation expense recognized	$ 0	$ 43,000	269,000
Options awarded
Number of shares options vest in	25
Period of considering closing price of common stock	30 days
Stock options compensation costs	$ 1,869,000
Contractual term (years)	10 years
Stock Options And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested share-based compensation arrangements with performance shares	$ 20,198,000
Share-based compensation expense recognized	$ 15,032,000	$ 13,908,000	$ 10,872,000
Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance options awarded to President and CEO	90
President And CEO [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options awarded	450
Minimum [Member] \| Time-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (years)	5 years 1 month 21 days	5 years 2 months 16 days	5 years 3 months 7 days
Expected volatility of stock	41.00%	43.00%	46.00%
Interest rate	2.31%	1.75%	1.06%
Minimum [Member] \| Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike price	$ 5.91
Expected volatility of stock	60.50%
Interest rate	1.75%
Maximum [Member] \| Time-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (years)	5 years 8 months 16 days	5 years 9 months 4 days	7 years 1 month 6 days
Expected volatility of stock	42.00%	48.00%	51.00%
Interest rate	3.01%	2.12%	2.02%
Maximum [Member] \| Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Maximum [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike price	$ 21.04
Expected volatility of stock	69.60%
Interest rate	2.73%
2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiry of options from the date of grant	10 years
Common stock reserved for issuance	11,099
Shares available for future grants	1,319
2014 Plan [Member] \| Time-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period beginning	3 years
2008 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 697,000	$ 664,000	$ 556,000
Company's common stock may be purchased at a discount	15.00%
Participants purchase limit value	$ 25,000
Description of participants purchase limit	Participants may not purchase more than $25 of the Company's common stock in a calendar year and may not purchase a value of more than 3 shares during an offering period.
Participants purchase limit shares	3
Offering period	6 months
Shares available for future issuance under the ESPP	595
2018 PSAs [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2018 PSAs [Member] \| Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 766,000
2018 PSAs [Member] \| Minimum [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock award threshold, target and maximum payout opportunity percentage	0.00%
2018 PSAs [Member] \| Maximum [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock award threshold, target and maximum payout opportunity percentage	200.00%
First Anniversary Date Of Grant [Member] \| 2014 Plan [Member] \| Time-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	25.00%
First, Second, And Third Anniversaries [Member] \| Stock Options, RSA's, and RSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	0.33%
Tranche 4 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	$ 17.50
Tranche 5 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	20.00
Tranche 6 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	25.00
Tranche 7 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	30.00
Tranche 8 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	35.00
Tranche 9 [Member] \| Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price by which volume adjusted weighted average closing price exceeds under vesting condition	$ 40.00