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Consolidated Statements of Changes in Redeemable Non-controlling Interests and Stockholders' Equity - USD ($) $ in Thousands | Total | Additional Paid-in Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Loss | Class A | Class A Common Stock | Class B | Class B Common Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Redeemable non-controlling interests beginning balance at Dec. 31, 2015 | $ 490 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests | 6,392 |  |  |  |  |  |  |  |
Net (loss) income | (35) |  |  |  |  |  |  |  |
Redeemable non-controlling interests ending balance at Dec. 31, 2016 | 6,847 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2015 |  |  |  | 0 |  |  | 28,684,392 |  | 18,000,000
Beginning balance at Dec. 31, 2015 | $ 287,409 | $ 110,311 | $ 182,321 | $ 0 | $ (5,228) |  | $ 3 |  | $ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options, net (in shares) | 321,000 |  |  |  |  |  | 320,892 |  |
Exercise of stock options, net | $ 1,054 | 1,054 |  |  |  |  |  |  |
Stock-based compensation expense, including excess tax benefits | 1,561 | 1,561 |  |  |  |  |  |  |
Open market purchase of common shares (in shares) |  |  |  | 1,298,418 |  |  | (1,298,418) |  |
Open market purchase of common shares | (6,387) |  |  | $ (6,387) |  |  |  |  |
Unrealized gain from interest rate hedge, net | 506 |  |  |  | 506 |  |  |  |
Foreign currency translation adjustment | (1,869) |  |  |  | (1,869) |  |  |  |
Contributions from redeemable non-controlling interests |  | 0 |  |  |  |  |  |  |
Net (loss) income | 12,032 |  | 12,032 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2016 |  |  |  | 1,298,418 |  |  | 27,706,866 |  | 18,000,000
Ending balance at Dec. 31, 2016 | 294,306 | 112,926 | 194,353 | $ (6,387) | (6,591) |  | $ 3 |  | $ 2
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests | 7,762 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (288) |  |  |  |  |  |  |  |
Net (loss) income | (3,983) |  |  |  |  |  |  |  |
Redeemable non-controlling interests ending balance at Dec. 31, 2017 | $ 10,338 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options, net (in shares) | 401,000 |  |  |  |  |  | 401,031 |  |
Exercise of stock options, net | $ 1,977 | 1,977 |  |  |  |  |  |  |
Stock-based compensation expense, including excess tax benefits | $ 1,293 | 1,293 |  |  |  |  |  |  |
Open market purchase of common shares (in shares) | 575,000 |  |  | 574,848 |  |  | (574,848) |  |
Open market purchase of common shares | $ (3,412) |  |  | $ (3,412) |  |  |  |  |
Unrealized gain from interest rate hedge, net | 310 |  |  |  | 310 |  |  |  |
Foreign currency translation adjustment | 655 |  |  |  | 655 |  |  |  |
Net (loss) income | 37,491 |  | 37,491 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  |  |  | 1,873,266 |  | 27,533,049 | 27,533,049 | 18,000,000 | 18,000,000
Ending balance at Dec. 31, 2017 | 336,620 | 116,196 | 235,844 | $ (9,799) | (5,626) |  | $ 3 |  | $ 2
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests | 5,198 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (410) |  |  |  |  |  |  |  |
Net (loss) income | (407) |  |  |  |  |  |  |  |
Redeemable non-controlling interests ending balance at Dec. 31, 2018 | $ 14,719 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options, net (in shares) | 909,000 |  |  |  |  |  | 908,851 |  |
Exercise of stock options, net | $ 6,696 |  |  |  |  |  |  |  |
Stock-based compensation expense, including excess tax benefits | $ 1,258 | 1,258 |  |  |  |  |  |  |
Open market purchase of common shares (in shares) | 218,000 |  |  | 217,774 |  |  | (217,774) |  |
Employee stock purchase plan, share issuance (in shares) |  |  |  |  |  |  | 51,380 |  |
Employee stock purchase plan, share issuance (amount) | $ 501 | 501 |  |  |  |  |  |  |
Open market purchase of common shares | (1,839) |  |  | $ (1,839) |  |  |  |  |
Unrealized gain from interest rate hedge, net | 413 |  |  |  | 413 |  |  |  |
Foreign currency translation adjustment | (250) |  |  |  | (250) |  |  |  |
Net (loss) income | 37,984 |  | 37,984 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  |  | 2,091,040 |  | 28,275,506 | 28,275,506 | 18,000,000 | 18,000,000
Ending balance at Dec. 31, 2018 | $ 376,875 | $ 124,651 | $ 269,806 | $ (11,638) | $ (5,949) |  | $ 3 |  | $ 2

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration