December 31,
2019 (1)(2)
2018 (3)
2017
2016 (5)
2015
Balance Sheet Data:
Working capital
$308,426
$269,857
$100,039
$31,625
$(2,360)
Total assets
3,257,534
2,122,455
1,861,639
1,902,295
1,975,788
Current portion of debt (6)
34,148
20,767
17,786
90,323
89,710
Debt (long-term portion) (6)
1,350,592
658,602
668,356
656,063
845,639
Stockholders’ equity
1,129,968
1,048,231
764,597
754,917
654,400

text: ITEM 6. SELECTED FINANCIAL DATA
text: The following selected financial data has been derived from our consolidated financial statements (in thousands, except per share data). This data should be read together with Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, and the consolidated financial statements and related notes included elsewhere in this annual report. The financial information below is not necessarily indicative of the results of future operations. Future results could differ materially from historical results due to many factors, including those discussed in Item 1A, Risk Factors.
text: (1) The consolidated balance sheet and statement of operations for the year ended December 31, 2019, includes the acquisition of Speedpay as discussed in Note 3, Acquisition, to our Notes to Consolidated Financial Statements in Part IV, Item 15 of this Form 10-K.
text: (2) The consolidated balance sheet and statement of operations for the year ended December 31, 2019, reflects the application of Accounting Standards Update (“ASU”) 2016-02, Leases (codified as “ASC 842”) as discussed in Note 14, Leases, to our Notes to Consolidated Financial Statements.
text: (3) The consolidated balance sheet and statement of operations for the year ended December 31, 2018, reflects the adoption of ASU 2014-09, Revenue from Contracts with Customers (codified as “ASC 606”), as discussed in Note 2, Revenue, to our Notes to Consolidated Financial Statements, including a cumulative adjustment of $244.0 million to retained earnings.
text: (4) The consolidated statement of operations for the year ended December 31, 2017, reflects the Baldwin Hackett & Meeks, Inc. (“BHMI”) judgment. We recorded $46.7 million in general and administrative expense and $1.4 million in interest expense, as discussed in Note 15, Commitments and Contingencies, to our Notes to Consolidated Financial Statements.
text: (5) The consolidated balance sheet and statement of operations for the year ended December 31, 2016, reflects the sale of Community Financial Services assets and liabilities.
text: (6) During the year ended December 31, 2019, we borrowed $500.0 million in the form of a new senior secured term loan and drew $250.0 million on the available Revolving Credit Facility to fund the acquisition of Speedpay. During the year ended December 31, 2018, we issued $400.0 million in senior notes due August 15, 2026. We used the net proceeds of these senior notes to redeem our outstanding $300.0 million senior notes due 2020, which we originally entered in to during the year ended December 31, 2013. See Note 5, Debt, to our Notes to Consolidated Financial Statements for additional information.

Questions:
question: What was the working capital in 2018?
answer: $269,857
scale: thousand
question: What was the working capital in 2019?
answer: $308,426
scale: thousand
question: What was the total assets in 2015?
answer: 1,975,788
scale: thousand
question: What was the change in working capital between 2018 and 2019?
answer: 38569
derivation: $308,426-$269,857
scale: thousand
question: What was the change in current portion of debt between 2016 and 2017?
answer: 72537
derivation: 90,323-17,786
scale: thousand
question: What was the change in total assets between 2018 and 2019?
answer: 53.48
derivation: (3,257,534-2,122,455)/2,122,455
scale: percent